I don’t understand what you mean. They wouldn’t be liable or responsible if they just did their job.
They aren’t the ones who would instruct people to riot or do terrorism, which would make them liable.
To construct a liability or responsibility out of their duty is what the fascist side would try to do, so I have to assume you’re one of them?
So far I am not under the impression that the government would not do what needs to be done. I think it’s obvious that 99% of Trump supporters are just talk, and mainly talk in anonymity on the internet.