To capitulate to them is a terrible idea. They had dozens of chances to prove in court that there was fraud, they never produced anything substantive. These people weren't convinced via proof, they simply believe whatever Trump tells them to believe. All you can do is try to contain it, you will never convince the core of his followers that he lost fairly in the election. If he were to lose another election then the violence would only get worse. We have a process, in 4 years they can vote again. When you give into a bully he will just come back for more the next time.