“Why is it people feel that as long as someone is running for office that person can not be prosecuted?”
Because autocrats arrest their opposition. Putin arrested Navalny. Erdogan arrested Ekrem Imamoglu.
We were obviously heading that way as the Biden WH coordinated the massive lawfare attack against Trump. Had they targeted anyone but Trump it might have worked, and the multilevel justice system would have been even more entrenched.
I believe they haven’t targeted the Clinton Crime Family for the same reason. Also, even though Trump appointed his people to run the various departments, those departments are so corrupted that it would be difficult, perhaps impossible, to bring them to bear against the Clintons. Democrats are a cancer in government.