It does sound crazy, but some of their echo chambers have spent YEARS repeating two conflicting messages 1) we need to use violence to "fix" the country and 2) anyone who actually tries to organize any activity is an FBI member trying to arrest people. It's true that a sane person still wouldn't try to go kill politicians by themselves, but it's no surprise to me that some of those members eventually do come to the "I am the only person who can fix this" conclusion.