-"Opening multi accounts is legal" says in the forum rules. Why is this given negative? Would it be a problem unless it signed the same signature?
Negative ratings are given to users who abuse signature campaigns with multiple accounts. If you are not joining the same campaign with your alt then no one will red paint your account.
-The purpose of the multi account is: "expressing yourself more comfortably". How can I express myself more easily if I say "this account is mine"?
Since majority of the users are using an alias what is stopping you from expressing yourself.