Agreed. You cannot tell a book by its cover.
But I suspect a higher percentage of guys dressed as outlaw bikers are actually bad dudes than those dressed in more normal attire.
As the Bible says, the race is not always to the swift nor the battle to the strong.
But that is the way to bet.
I'm sorry, but what exactly is "normal attire" when riding a bike?
All that leather and stuff isn't just for looks. Since all you have between you and the road is what you are wearing, leathers will literally save your skin if your bike goes rubber side up.