We started off with people who UNKNOWINGLY shielded the attacker.
Your example of someone dressing as a fan of one team and attacking fans of the other team.
Now you're to the point of discussing people who actively support the attacker.
Instead of that, why don't we continue to focus on the reactions of the people who don't fully support the attacker yet.
The one's that form the crowd he is hiding in.
You go to a ball game.
You're cheering your team.
Arabs start shooting at the crowd you're in. Hitting and killing many of you.
But they were just trying to get the one person hiding in your crowd.
Feel free to blame the person they claim to be shooting at.
Rather then them for actually killing the people who weren't involved.
Again, full circle. Let's breed another generation so we can continue the bombing.