大多数声音说，钱学森因为爱国，所以离开美国回到中国。

英雄的行为模式总是很简单，a且仅有a就可以推出b。简单就是完美，比如1+1=2。英雄必然都是完美的，故他们的行为模式必然简单，从崇高到伟大，不能有他。

你我都是人，所以不用借助任何理论，你我就都能知道，理解和认同这一点：正常人正常状态下应该是复杂的丰富的，有时候甚至是自相矛盾的。在绝大多数情况下，一个人的行为，从intention的形成到付诸实施都是很多因素合力作用的结果，并不是从a就可以直接推到b。一个道德的人，a起码就应该是两个元素的集合：a1 private interests 和a2 public interests。没有a1此人不是正常的自然人，没有a2此人不是合格的社会人。这两种利益的碰撞，摩擦，斗争，妥协，实在是千变万化。最后哪一种被真正实现，充其量只能说是一个accident。更具体一点说，a1和a2都是决策人主观的第一人称的，是个人对于这些interests的理解。而关于对某些事情的理解，是人与社会，他人，环境，自己interaction的结果。由于外界因素的不可控，这个interaction的结果只能被定义为happen to be what it is，并不是必然如此。既然causal link里面的cause都是一个accident，由这个cause引发的result也就是个accident。既然不是必然如此，并不必要称颂一个accident b（钱学森离开美国回到中国）的发生。称颂b（离开美国回到中国）发生了以后的成就就可以了（因为从这段引文可以看出成就的发生也可以由非b, （i.e.没有离开美国），引发，所以成就并不是accident b的结果，不构成因果关系）。

我觉得钱学森是一个非常非常牛的科学家。

以下是转载wiki上关于钱学森的一段，原文link:

http://en.wikipedia.org/wiki/Qian_Xuesen#Career_in_the_United_States

对于五个军团为什么回归，不妨揣测。

Career in the United States

Left to right: Ludwig Prandtl (German scientist), Qian Xuesen, Theodore von Kármán. Prandtl served Germany during World War II; von Kármán and Qian served the United States; after 1956, Qian served China. Qian's overseas cap displays his temporary U.S. Army rank of colonel. Interestingly, Prandtl was von Kármán's doctoral adviser; von Kármán in turn was Qian's.

In 1943, Qian and two others in the Caltech rocketry group drafted the first document to use the name Jet Propulsion Laboratory; it was a proposal to the Army for developing missiles in response to Germany's V-2 rocket. This led to the Private A, which flew in 1944, and later the Corporal, the WAC Corporal, and other designs.

After World War II he served under von Kármán as a consultant to the United States Army Air Force, and was given the temporary rank of colonel. Von Kármán and Tsien both were sent by the Army to Germany to investigate the progress of wartime aerodynamics research. Qian investigated research facilities and interviewed German scientists including Wernher von Braun and Rudolph Hermann.^[8] Von Kármán wrote of Qian, “At the age of 36, he was an undisputed genius whose work was providing an enormous impetus to advances in high-speed aerodynamics and jet propulsion.”^[2] The American journal Aviation Week & Space Technology would name Qian its Person of the Year in 2007, and comment on his interrogation of von Braun, "No one then knew that the father of the future U.S. space program was being quizzed by the father of the future Chinese space program."^[9]

During this time, Colonel Qian worked on designing an intercontinental space plane. His work would inspire the X-20 Dyna-Soar, which itself would later influence the development of the American Space Shuttle.

Jiang Ying in 1947

Qian Xuesen married Jiang Ying (蒋英), a famed opera singer and the daughter of Jiang Baili (蒋百里) and his wife, Japanese nurse Satô Yato. The elder Jiang was a military strategist and adviser to Chinese nationalist leader Chiang Kai-shek. The Qians were married on September 14, 1947 in Shanghai, and would have two children; their son Qian Yonggang was born in Boston on October 13, 1948, while their daughter Qian Yungjen was born in early 1950, when the family was residing in Pasadena.^[10]

Shortly after his wedding to Ying, Qian returned to America, to take up a teaching position at MIT; Ying would join him in December 1947.^[11] In 1949, upon the recommendation of von Kármán, Qian became the first director of the Daniel and Florence Guggenheim Jet Propulsion Center at Caltech ^[12].

Soon after Qian applied for U.S. citizenship in 1949, allegations were made that he was a communist, and his security clearance was revoked in June 1950^[13]. The Federal Bureau of Investigation located an American Communist Party document from 1938 with his name on it, and used it as justification for the revocation. Without clearance, Qian found himself unable to pursue his career, and within two weeks announced plans to return to mainland China, which had come under the government of Communist leader Mao Zedong. After Qian's plans became known, the U.S. government detained him at Terminal Island, an isolated U.S. Navy facility and Federal prison offshore of the ports of Los Angeles and Long Beach. The Undersecretary of the Navy at the time, Dan A. Kimball, tried to keep Qian in the U.S., commenting:

"It was the stupidest thing this country ever did. He was no more a Communist than I was, and we forced him to go."^[14]

Qian became the subject of five years of secret diplomacy and negotiation between the U.S. and China. During this time he lived under constant surveillance in a state of near house arrest.^[15] Qian found himself in conflict with both the FBI and the U.S. Immigration and Naturalization Service, and at one point was arrested for allegedly smuggling secret documents out of the US; these ultimately turned out to be simple logarithmic tables. During his incarceration, Qian received support from his colleagues at Caltech, including the institute's president Lee DuBridge, who flew to Washington to argue Qian's case. Caltech appointed attorney Grant Cooper to defend Qian. Later, Cooper would say, "That the government permitted this genius, this scientific genius, to be sent to Communist China to pick his brains is one of the tragedies of this century."^[16]