So what exactly does this do other than punish the fans for their government's actions? I don't really think this is effective at all. Any Czech government authority could care less about what some American hardcore band has to say. The "message" you are sending is going to fall upon deaf ears to the people who are your targets and your Czech fans (the ones who actually care about your band and want to see you perform) get punished in the meantime.
This is all that needs to be said.