I agree, you can't force a manager not to pick players, but there are only two possible scenarios here. The first is that Warnock hasn't done any homework on the Dons at all, or he'd have known that his setup of players out of position (Morris massively, MacKenzie also and I'd argue Devlin) wouldn't work. That lineup was a sign of someone absolutely ignorant to our entire season, there is no other explanation. He strikes me as the type that would be obnoxious enough to suggest that everything up until now was the other guy's failings, and nothing to be learned. If he has done his homework, then he's just not very good at reading games of football. The second is that Warnock hasn't done his homework, because he's not been in the door long enough (or he doesn't feel it's a worthwhile exercise like above). In that case, it takes a spectacularly ignorant human not to ask the people around you at the club what has worked and failed and exactly why. My opinion is that he'll have asked Leven for a good overview of what works. He's either not listened to any of that and done his own thing, or Leven and others at the club are absolutely clueless, or frightened to give an opinion. Either way, it lacked professionalism and they certainly got the message from the fans last night.
I think this sums up what my issue was with signing Warnock until the end of season. He's here for a really short time with zero experience of the game. Nobody who has been watching Scottish football this season would have made those errors last night. Similarly @tlg1903's point about Warnock being here on a jolly absolutely rang true. He's clearly either not done the work required, or deferred that authority to someone else until he gets up to speed. It was a completely unprofessional performance.
There is absolutely no credit due for the early changes either (Robson wouldn't have had us three down, we'd have to go back to Goodwin versus Hibs for anything like last night). It maybe wasn't clear on red TV, but the hostility at the ground was immense (there was fighting in the RDS, but that was down to a Motherwell fan in corporate). It was probably the most toxic I've seen it since losing to the Hun in that game under Goodwin. The fourth goal was coming too, and I think Morris would have subbed himself, given how frightened he looked when he accidentally got the ball once after coming out of hiding from behind his marker. There was literally no choice but make a sub. It did bring a great light hearted moment though. I thought it was fairly obvious we were making a double change, but clearly most of the ground were unaware, so when the board went up with Polvara's number and not Morris' the crowd went mental thinking he might be staying on. I don't know how they choose the order when making a double sub (maybe it was the fourth official having a laugh), but they should perhaps take note for future to make sure that you always take the horrendously shite player off first. I'm certain a couple of heart attacks could be avoided in future.