You are correct about all of us being subject to collection, but there is a HUGE difference between collection and no dissemination and transcribing and unmasking for political purposes.
This is illegal.
I agree, but to have a trial for people violating the law on the latter would open up discussion on the former. No one in Congress wants to answer to their constituents about how this could happen in the first place. Congress has assured us repeatedly that they have put in place all the necessary controls to prevent this sort of abuse from ever happening.
If it gets out that Obama abused our surveillance capabilities it's everyone in Congress who would wind up with egg on their faces. That's especially true for those in the Intelligence Committees who are supposed to be providing oversight of our intelligence agencies.