Depends on the level of war crimes. Its kind of like a real fight between men. If someone hits you once or twice it is likely to make you angry and you will fight harder. But if he beats you to a pulp and comes close to kill you, you will likely be afraid about losing ur life and likely beg to preserve your own life.That sounds dangerously close to endorsing war crimes against civilians, since civilians are meant to be left unharmed and protected by warring parties.
There are already allegations of war crimes being committed by Ukraine in Kursk. If those claims are substantiated and widespread, then Ukraine would not so much have shot themselves in the foot but blown both its legs away. Since such barbarism would open the door wide open for previously neutral parties to take a much more involved role on Russia’s side, as well as weaken the support of Ukraine’s already wavering western backers.
Also, as a general point, doing a war crimes against civilians tend to strengthen, not weaken their resolve to fight.
Ukraine doing raids like this only enrages Russians and makes them think Ukraine is a problem that needs to be solved once and for all. It increases support for war. But if Ukraine had overwhelming strength and Russia was afraid of losing a lot of land or people. Im sure they will give up on Ukraine completely.
But Ukraine simply lacks the strength to force Russia to give up. Instead all these attacks only justifies more mobilization for Russia