Not proud of it, but i've robbed a good amount of dealers. Never friends who were dealers though.
First time i ever did it, was because the fucker skimped a bulk package of roxies(supposed to be 120, only 88 ).
Not the first time he did it either, and not only to me. (so of course i would thinks it's justified)
The guy always did the deals at his house too, so i knew everything about him to an extent (no guns, no tasers, no mace, no safes to crack).
Broke into his house with three friends wearing random halloween masks and locked him into his bathroom (no windows or anything).
Found his stash of about 300+ roxies, 2 grams of some dope, 30 tabs of some sort of psychedelic (def was not LSD, probably DOB), and a half pound of brick weed. He was just some upperclass trustfund baby so I know it didn't really affect him, but looking back it was just a stupid thing to do. I could've gotten thrown in jail if someone had heard all the ruckus and would have gotten all my friends in trouble as well.
Flash forward 2 years, and i'm in the opposite position, went to a drug deal where I was selling a half g of crystal. I meet up with this tweaker in a shady street in Palmdale, someone i've already sold to before. "Did you weigh it out? can i check it?" "Yeah man, .5 right on the dot" -shows him bag under cell phone light- "Alright..." he paused and grinned for awhile awkwardly. Then he pulled out a .22 and just said "lemme check it". I lift my head up to come eye point with the barrel. Long story short, it did not feel good. But that's the only time that's ever happened, especially when i got my hands on a 45. (just started flashing that whenever i did those type of deals).
But that's just how the hard drug culture is. Dealers skimp you. It's more cost effective to them, because if you're a dealer, you're not focused on being a nice guy, you're focused on making money. Being skimped comes with doing/buying drugs. But i'm not saying I don't believe in some form of vigilante justice (not violence) when it comes to underground matters. It's all up to that persons mindset.