“It is not going to be possible to prosecute Obama.”
There are statutes that protect government officials and agents under the concept of sovereign immunity.
They were designed to protect people acting in good faith to accomplish their duties.
However, nothing protects an ex POTUS from charges under the Civil Rights act when they act, or conspire to deny somebody’s civil rights under the color of law.
It’s a very specific and powerful exclusion to Sovereign Immunity laws.
I’m not saying he can’t be prosecuted LEGALLY. He can be impeached, and he can be prosecuted.
I’m saying that the act of convicting the immediate predecessor of a sitting President is fraught with danger, and, were it done, our system would be changed in many ways, some of them unpleasant.