God I hate this mentality.
Yeah, you can exploit this, but are you doing anything fun or interesting by it?
I live in a community that has a lot of cyclists in it. If I'm at home, I tend to spend a lot of time on my front porch working on my bikes with my friends. Most of them know that I keep some tools slightly "hidden" there, and I've told all of my friends that they're welcome to come over and use them if I'm ever not there.
Could they steal these tools?
Yep.
Would they would demonstrating some OMG SECURITY HOLE in my "Ryan's Porch" scheme?
No. They'd be acting like assholes, which is exactly what this guy is doing.
I'm an amateur locksmith. I usually keep a half diamond pick and a torsion wrench in my car, and sometimes I even carry it in my pocket. Could I steal half of the bikes locked up across the street from my house?
Could I break into buildings and steal things from them?
What if I donated the money to poor people?!
Sam Odio, you're being a jerk here. Knock it off.