Naturally, I hope you include Donald Trump in your 4th point. I certainly do.Oh...OK....simultaneously....
1) Continue the formal process of counting votes
& inaugurating Biden.
2) Invoke the 25th Amendment.
3) Improve security in all venues subject to MAGA attacks.
4) Arrest & prosecute all wrongdoers.
I have heard the argument about turning him into a "martyr" for his followers, which would only make things worse. I don't buy that for an instant. I don't buy it because if you want to be "a nation of laws," then upholding the law is the minimum price you have to pay.
I also don't buy it for the same reason that I don't believe that terrorist kidnappers should be paid ransom for the return of those kidnapped. That only gives them reason to do it again. It is surely a tragic thing, and I would hate to be the decision maker in such a situation, but I believe it is the only possible decision.