I think it's pretty obvious from several first-hand sources (including the great Chris Whitten) that MK was quite an asshole in early 90s, and it's pretty obvious from at least as many sources that MK is a pretty nice guy from 1995 onwards, with the possible exception of anything related to ex members cover bands (remember the horrible, mean spirited song Terminal Of Tribute To) and the extremely weird RnR Hall of Fame debacle. So my deduction and conclusion is that MK has been pretty much a nice chap and in peace with himself for 30 years but obviously still hates Alan Clark.
TOTT is quite nice musically, but so harsh lyrically, yes.
I think Alan's behaviour, like his horrible sentence "Mark was not such an important part of DS after all" led to it, but this is really too bad. Alan is a very talented keyboard player, probably the best Mark ever had. Jim is a master of piano, true, but something of the raw DS energy is still missing.
Mark is like Dr Knopfler and M. Mark to me.
When he is happy and gets what he wants, he can be quite relax. He respected a lot Pick and Alan's talent. He let John, Hal, Jack have the most ridiculous stage attire and dancing attitude. He never tried to replace John, although there were certainly more competent bassists around, just because John was so loyal.
On the other hand, when his is grumpy and doesn't get what he wants, he can be a ass. He didn't give space to his own brother. He didn't like it when Pick had his own magazine cover. He let Jack and Terry down when he didn't need them anymore. And there is of course this whole OES tour grumpy behaviour that has been discussed at length here...
I guess MK is simply human, with a light side and a dark side. But there is still good in him! 😊