It would make sense if they had to scrub logs and emails for legal reasons in the future.

IANAL, but Twitter is a private company fully owned by Musk. This might be a publicity disaster, but legally they should be fully in the clear.

Is the spoilation of evidence not evidence of the original issue itself in civil cases?

I was going to say "legal or PR reasons" but was too lazy to type it out.

Should anyone care?

The person who’s trying to fashion himself a free speech liberator while being a capricious egomaniac who invents transparently post-hoc justifications for his selfish hypocrisy on a platform with world changing impact and expects the same world to just accept his manufactured reality because he’s used to getting his way… yeah, that seems important to me.

Maybe