No, personally, I did not know Cobain. Neither did you, I can assume. Yes, I know he was on drugs and all of that, and sure, I know he had some problems. But I do not see why someone who was one of the most famous and influential people of his time would kill himself over drugs or selfishness like depression (don't take that the wrong way, trust me. I know what depression is like and it f*****g sucks, but there are ways to fix it without killing yourself). I mean, I would see it as selfish because, if it was suicide, he's leaving his bandmates/friends in the cold without him, abandoning his new baby, and - of course - it hurt his millions of fans, all because he felt bad and wanted his drugs.
As for the B. S about suicide vs. Murder - I just have to say we'll have to agree to disagree because I prefer not to argue over something neither of us witnessed.