Can't be bothered trying to sift through the wealth of info in the link, as i'm existing on borrowed time. However, i believe the threat was made against Moz in one of Doherty's less lucid moments (and, let's be honest, there've been a few) after seeing Moz on the front of NME with his arm around Carl Barat.
I think Mozzer genuinely feels sorry for Doherty, but he would obviously have taken the side of his former bandmates against Pete, because of his own experience; the sympathy is probably due to his hounding and / or glorification / demonisation by the evil British tabloid culture.
I can't say what leads people to take drugs or to become addicted, but i know that, from experience, there's only so much sympathy you can have for an addict before breaking with them becomes the only option left for your own sanity ... and to hell with the personal consequences.
Doherty, Cobain, Vicious, etc should not really be feted the way that they are, or were; it's all well and good to stand back and admire a star as being 'rock n roll' for their life of excess and dangerous appeal, but to be fair, you wouldn't want to be around them at three in the morning, waking up to find a pool of vomit in the bed and bruises on your body due to their 'bad trip'.
Anyways, if Doherty ever does to Moz what he did to Johnny Borrell, then i'm sure all of us on this site would gladly pay him a visit ... with a baseball bat.