But they were never called upon to defend those ideas - that's the whole problem with the series! Sure there was the odd bit of hand waving but there is never
any serious attempt to look at any struggle of ideals.
It was also absurd that people who had turned their back on star fleet (at least a couple were deserters) would just put on the uniform and suck it up.
Voyager just didn't ring true, that's the problem with it - there is no emotional truth to the series or the development of the characters (what little developed occurred for many of them) on it.