Correct me if I’m wrong, but aren't people who use alts to avoid bans supposed to have their ban extended?

Maybe.

additionally, bringing attention to trolls/alts is against the rules. one could interpret the trolls/alts attention seeking behavior as bringing attention to themselves, and therefore they should be banned

Nope. Neither the terms of use nor the MSMG rules say anything against ban evasion. The only case where you can get your ban extended is if you break the terms of use on the alt.

ive seen sitemods delete alts of users they dont like before

That’s because the terms of use apply to users, not accounts. The alt can be deleted, but the ban cannot be extended.

Ion know

pretty sure yeah

Personally I think it should just be a rule that obviously ban evading alts can be permabanned by ANY mod