To make decisions out of fear can kill you.
This is soundbite-y but not really meaningful. Being afraid to walk into a cage with a hungry lion in it will keep you alive.
The parent post seem to make a lot of sense, and even if what you're saying is true, it doesn't really answer. That there were a "portion of engineers" who felt that way doesn't necessarily mean that was the final reason why they did it.
And I'm not sure I agree with the "Sun ought to have put everything into the GPL" thing. Why? The GPL and the FSF movement is a wonderful thing, but *Sun* does not *owe* their code to the movement such that they ought to do everything for the benefit of it, without considering other ramifications to things they may also care about.