What do you want them to do besides increasing security?
No one wants to vindicate the guy by preemptively taking action against him for the uprisings that haven't yet occurred even if we're absolutely certain that they will in fact happen.
Biden is retiring after this term. Even though he has the power and can offer valid reason for enacting an official act against Trump I don't think he wants to be responsible for sparking any sort of conflict or be known for it after he retires. The man has done a lot already, this isn't a burden that falls squarely on his shoulders. It's our burden as a country.
Cool cool cool, and how do you propose those things happen? Executive action isn’t some magical power that lets a president wave their hand and make something happen, they are still vulnerable to legal action. In order to properly implement everything you’re talking about would require action from the house, the senate, and the president.
Even if he had some magical all powerful hand wave, it could be immediately hand waved away by the next republican president. And republicans would cheer.