I don't quite understand you. Are you saying that attacking political activists is more acceptable than attacking someone during "routine circumstances" (such as a pub brawl, I presume)?
I live in Finland, where our criminal code actually has a separate crime called "infringement of freedom to political activity", for threat of violence or endangering well-being of others who express their opinion, participate a demonstration or set up an association for peaceful political activity. So attacking someone at a political rally is a worse crime than a random violent attack.