IMO, one of the big reasons that the Maloofs neglected to reup Adelman was cost. Adelman was getting 6M a year IIRC. This was the top or near the top salaries of coaches at that time. Maloofs didn't want to pay that. The next 4 or 5 or however many coaches afterwards got 2M/year contracts. Also, you can't deny that Reggie sure looked better than Adelman in a suit. He's TV good looking, for gosh sakes. Again, you don't like the move, but you understand the move in Maloof shoes. It has rationale. Firing Malone and grabbing Karl? I would hate the timing, but I can see how you would go with an experienced head coach. Firing Malone for JVG? Sure. Firing Malone for Thibs? Hell yeah. Firing Malone and promoting Corbin? Come on.
You can't fight against crazy because crazy has no discernible plan. They don't know what they're up to next, so you don't know either.