So Garand Thumb is showing how badass and hardcore 10mm blows away gel tests. That's why. But I've seen this Morgan and Morgan lawyer firm pushing on subjects that I don't think that if they found out that you were watching 'omg, stopping poowwwaaa' type vids would help your case. Wavywebsurf also used these guys as sponsors for his crime vids, and again, I think if you fuck up and get in court, your online history isn't going to help you. Link to the sponsor timestamp. And the audio is all screwed.
ETA there are always plenty of studies out there that even in a red state if you use a so-called 'assault weapon' in a legal defense situation the judge and jury will be more likely to convict and give harsher sentences than if you used what a cop would use like Glock.
Reality is a bitch.