Well, you have to be pretty thick to not realize you're housing a bunch of bikers who are dressed up as
bikers. And you have to be nearly as thick to not realize that if you are housing a bunch of bikers under the radar, it's not because they're planning a birthday party or something.
Also, the whole point of a safehouse is that it's something no one knows about. Or at least as few people as possible. Hence the use of the word "safe" in "safehouse." It's not a "let's go to that one property we publicly own or are otherwise known to associate with to hide out; surely no one will think to look for us there"-house.
Edit: I apologize if I sound confrontational. It's not my intent, but after reading over the post it does seem that way evne to me, and I'm not sure why.