If they commit a crime, a judge and/or jury, informed by the testimony of medical experts, determines whether someone was cognizant of right and wrong. This is not uncommon in the criminal justice system.
Now, responsibility on the larger scale is indeed murky. We societally at once say addicts are and aren't responsible for their behavior (depending upon one's point of view and what acts took place): a drunk driver is treated differently than a homeless addict living under a bridge. Is Kanye 'addicted' to manic states? Should we look down upon him because he won't take his meds? I'm not sure.
This is no where near the same situation. When Elon originally put is offer to buy Twitter, Twitter didn't even want to sell. Then the market crashed and all the sudden Elon's own offer was almost double of the "fair market price" for Twitter.
Elon would be insane if he made the same offer today.
Twitter clearly took full advantage of his irrational hard on to get a signed deal. Not “being scammed” in that Twitter very nuch did not seek out the deal, but they certainly fully leveraged his willingness to toss out preconditions any sane purchaser would demand.
> Having a celebrity owner increases the value.
As a mascot, maybe, unless they are polarizing and their area of negative appeal overlaps with the product’s market and their positve appeal doesn’t; but owners are also decision makers, and celebrity’s are going to be all over the map in that role.
Twitter didn't want to sell to him in the first place. Musk's buyout offer took place in the context of a months-long drama about Musk being on the board. It's hard to look at the Musk/Twitter situation and say that it was driven forward by anyone other than Musk.
(I have no particular reason to believe Musk is in anything less than full control of his faculties.)