Earlier I was mostly speculating now it looks like things are getting worse as leftists/progressive/socialists have escalated to physical assaults in at least one occasion. Based on information outlined previously I see little reason to dismiss the chance of violent outbursts as mere speculation. Rather this would be a good time to determine what your risk level is and if that is something you are willing to accept.
It goes without saying that yard signs and bumper stickers make you, your home and your vehicle and those who share your life with you potential targets for vandalism and violence. You need to determine if this is an acceptable risk and you need to involve those who share your life with you in that decision. I’m not saying don’t fly the flag I’m only saying decide if the risks that come with this are something you’re willing and able to deal with.