I managed to amass a pretty good horde of downvotes the other day with a sentiment that mirrored this comic. I probably meandered and missed my meaning but the comic author nails it
You arrest the leader of a belligerent faction by forming an army and defeating their army. Not by knocking on their door and serving papers. The ICC really doesn’t have any purpose except punishing the losers once the war is over. The winners always seem to walk free, no matter what heinous shit they did to get that win.
Play out the game theory of that in your head and think about what effect the threat of war crimes prosecution for losers (only) has on how and when leaders commit war crimes. (Hint: it strongly encourages doing ANYTHING to make sure you win)