That's an incredibly stupid argument.

What else are you going to justify with "but it's the law!" argument?

People getting death sentences for rejecting Islam in Saudi Arabia?

People being thrown in jails for being gay in Uganda?

And don't get me started on what was "the law" in Germany less than a century ago..

Yeah, the only bad thing about Zelensky's concentration camps is that it's not written in the law, otherwise it would be all good and fine...