Professionally and privately, I have dealt with banks in their various functions for decades. It starts with the usual things as a private individual (checking account, investments), continues with private and professional trading in securities of all kinds and markets (for asset management), and also various credit matters in the private and professional sectors. Of course, not all contacts were negative, but overall distrust is justified. Whenever there was an opportunity to gain a legally flawless but morally questionable advantage, hardly any bank or bank official was too proud to take it.
Besides the loan I mentioned here, I recently had the classic case on my desk again: a wealthy, elderly woman goes to the bank advisor (DeuBa) and wants a conservative investment strategy. She trusts the guy, and he loads her portfolio with the wildest securities. There was constant, pointless reshuffling to collect fees. Of course, she naively signed everything he presented to her. What some bank advisors do to small investors extends up to the big players as well, see the Libor scandal, to name just one example.
Well, to each their own opinion.