What your asking for is trust.
Well do you trust the guys at your gym? More then you trust your postal carrier?
And another note just cause someone is big doesn't mean they are rejects. Just cause they are different from you also doesn't make them someone you should run from. Just make sure you know your facts when it comes to AAS.
Let me give you an example. There is this big huge power lifter at my gym. He is massive even for around here. Yet when you speak with him he is highly intelligent and knows his stuff on various subjects. Including motor bikes and fast cars to renovating houses. And he looks like the shaved headed biker type.
You know what this guy does for a living? He is a premiere Microsoft Enterprise Database support team Manager. Not what you would expect from a muscle head or nerd.
So the moral is don't judge a book by its cover.