Russia will kill half of them anyway after the war.
Why? What sense does that make? When has there ever been any reason to believe that the goal is to kill Ukranians? This isn’t even the first time I’ve seen it said that if Russia wins (or even loses!) they’ll just wipe out all Ukranians afterwards. And neither time has there been any reasoning for why such an absurd claim should be believed.
If you truly believe this drivel, you’re doing everyone a disservice by not attempting to justify your claims. If you truly believe it and provide justification, you might just convince others to believe what you do.