First off, yes, he didn't want to buy Twitter. That much is established fact. He went to court to get out of buying Twitter (unless we're suddenly supposed to believe that was some kind of elaborate 5D chess move made for reasons our puny mortal minds cannot understand).

Given that he didn't want to buy the company in the first place, why would he be digging that hole deeper by deliberately destroying it?

"He's a idiot" is not a satisfactory explanation. Idiots don't crash their cars on purpose just because they were idiots. They crash their cars for numerous reasons such as texting and driving, drinking and driving, etc, but not "Because they wanted to."

To be clear, Musk is an idiot. We can thank this whole debacle for finally helping people finally grasp that. But he thinks he's smart. He thinks he's a good businessman. That's why he's doing all the things that he's doing; because he genuinely thinks this is how to be successful. That's why he attached his beloved X brand to this sinking ship; because he's too caught up in his own ego to recognize that it's sinking, and that he's the one sinking it.

"He's trying to kill Twitter" is an excuse that people come up with because they spent so long believing the man was a genius that now they can't square that with the recent flood of evidence that he's not. So they need there to be some other explanation. It can't be that he's just incompetent. It has to be that this is all part of his master plan. This is no different than QAnons trying to rationalize away every stupid thing Trump does by claiming its all secretly genius.