Well.. if even 5-10% know how to defeat the retention you basically have to anticipate that everyone can. Might be a bit more difficult for LEO because they basically know they are going to jail so in something like a scuffle a desperate person is capable of anything.I don't know how you would quantify how much is exaggerated.
I will defer to your expertise on whether or not this is common practice but I do have a question to ask you, If that kid hadn't practiced defeating the retention device on that holster how did he manage to get the gun out of the cop's holster that fast?
It may have been pure dumb luck but it sure looked to me like he knew exactly what he was doing when he drew that gun from the cop's holster.
They are not all dumb but I wouldnt say they are smart either. Pretty dumb in the long run to be a criminal unless maybe you are going into politics and dont have a moral code. Maybe "opportunistic predator" would be a better word.
Stay safe out there. Im not a huge fan of LE but I do like the few good ones I meet/know. Either way Im not a fan of people not making it home after work. Kinda suprised more LEO dont use lanyards but a lot of these holsters have such good retention now I guess its just overkill.