What you are describing is an intrinsic problem with modern banking, not with Bitcoin. A Bitcoin exchange partnering with a bank in order to make Bitcoin more useful and convenient is no more a betrayal of ideology than for someone to trade one bitcoin for a fiat piece of paper. I'm sure you have traded some bitcoin for fiat at some point, yes? If so, may I ask, do you really support the global militant empires which are based on the fiat paper to which you just gave value?
And even then, bitching about some people not submitting to some ideology is absurd. There is no ideology in bitcoin itself, it is just a tool. People will use bitcoin as they will, and no one can prevent them from using it as they will. I would recommend everyone to stop nagging about what other people are doing, and instead focus on doing something productive yourself that promotes your ideals and goals for the society.