A majority of the people on this forum are absurdly biased and quite illogical in terms of their belief that the "government" and the "greedy bankers" and so fourth are all after them and after Bitcoin. The harsh reality is that Bitcoin is a literal drop in the bucket in terms of financial markets - it makes little difference to any of the major players (both Federal and commercial banks). They don't bother helping Bitcoin because it's too much effort for little to no return. They occasionally go after people who use Bitcoin alongside their bank accounts because of their own TOS or money laundering or not wanting to deal with a customer they consider "high risk".

TLDR: The banks don't actually care that much - it doesn't make a significant different to their bottom line in helping Bitcoin (actually the opposite) so they don't.