I agree with the evilness of the regime. However, the problem is that when individual countries start to decide who is evil and who not, countries just declare someone evil when it is convenient to them ("there are nazis in Ukraine!") and you have a pretense to invade a country.

International law and organizations exist to avoid this issue. But the US and Russia (and maybe China) have been systematically undermining international institutions because they like to be able to attack someone at their convenience and not be held responsible for it.