That kind of thing gets said literally a million times a day with other ethnic/religious groups. "White people should all be killed and eliminated from the earth." You can report these and X may or may not delete it, and there is possibility they could suspend or even permanently ban the account, but it isn't very likely. However, very rarely will police get involved since it happens so often and is almost untrackable. What the catalyst was here, I feel, is that he was a vet and was very vocal about his enjoyment of the second amendment. The "anti-semitic rhetoric" on top of those other things lets them add a little note to his record. One of the cops seemed to be writing down his license plate number and vehicle make. I'm sure they will be watching to see if he screws up on the smallest traffic violation.