You do realize that all of that happened, not because of a drug, but because they were irresponsible people, right? A non-addictive drug didn't cause them to do that... You're placing the blame on the drug, when it belongs on the people. If that ignorant oversimplification is fine with you, they hey, never bother learning about these drugs you claim to understand. (but don't) It's much easier to say "oh, he was a good kid, he just got messed up in drugs" than it is to realize the truth and say "well, he was a good kid, but he wasn't responsible enough to handle his own life, and ended up being foolish enough to commit suicide because of his (fixable) mistakes." Nobody wants to hear or admit that their friend/significant other/child was wrong... but they're quick to make outlandish claims that some non-addictive, non-lethal drug killed them.
I've been smoking weed on and off for a little over 10 years. In that time I've graduated both high school and college, and held many professional jobs, including a 5 year enlistment in the US Army. Marijuana has never gotten in the way of my life or responsibilities, and when I couldn't smoke I didn't. Moderation and self respect/will power isn't something everyone has. But you can't blame a drug for people's short comings; they could've done the same thing with alcohol, which is completely legal, addictive and exponentially more deadly than marijuana.
All I'm saying is, if you don't understand the effects of a drug, and you obviously don't, then don't make false comments about it.
By the way, I'm sorry to hear about your friends, and sorry if I came off as being crass.