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It’s clear Dr. Chen does not consider China to be an adversarial government. Believe it or not, many idealistic people believe in a collaborative future, and unless Dr Chen’s work is classified or military in nature I don’t see a reason to assume anything but the best.
Similarly, he may have committed a crime like espionage but I don’t see any reason to assume this is true unless the government can bring forth evidence supporting that. Such evidence has not materialized yet.
If I study forestry and collaborate with the Canadian government, am I betraying the United States by helping a competing economic power get ahead in forestry? Ultimately, these sort of arguments always rely on moral absolutionism that China is Bad Always. Not everyone agrees with this.