That is an extremely important distinction. Further, there are legitimate actions by the FBI in the cases of real judges and representatives in their public corruption prosecutions (see Kids for Cash). In this case, though, the charges are intended to intimidate. That is exactly what the director's tweet communicated and why it was deleted.

Oh my god, no, that never happened at all. This is a fever dream. How in the world and constitution Could Biden IMPEACH Trump when he wasn't a member of the House of Reps, which is the body that impeaches Presidents. Actually, Biden also couldn't arrest Trump, as federal arrests would be by the AG. Famously, Merrick Garland took forever to bring cahrges to Trump, and, unlike Trump did with his AGs, Biden never interfered.

Do you have any sources for this "famous" impeachment and arrests?

> I’m not sure if I’ve ever heard of so many attempts on the same president.

Because no other President tried to start a violent coup when he lost the election! That is a good reason to arrest someone, which is included in your vague "variety of reasons".