There is no going back to pre-Trump era politics for republicans. Their brains are permanently broken and will only get worse the longer Elon controls Twitter. The algorithms dictate a constant descent into this madness. "Democrat cities are corrupt" used to be a pretty common, sometimes effective talking point for republicans. Remember when they were trying to tie Obama to Kwame Kilpatrick lol?
The DOJ has gone after multiple dems since Biden became president. For legit crimes. They've gone after some republicans too, like George Santos. That's how the DOJ is supposed to operate.