Our culture has got to get over the bullshit ratfink/tattling is bad mentality. It's complete bullshit that even victims are shamed by people for calling the cops. This guy had his wallet stolen. It's not his fault the thief was also dealing drugs. The guy was a sleezebag drug dealing thief. And yet OP was somehow supposed to just let that guy keep his wallet? He had every right to call the cops.