For example, do you really think that by charging putin, that he'd really get arrested in participating countries? Or would the warrant be ignored?
And if putin does lose his war, and goes into exile, the ICC warrants would then be possible to enforce (now that no nukes is on the line). But putin knows this, so if the war goes badly, would it not make better sense to fight it out to the bitter end, rather than lose out to being arrested if he goes on exile?
The court that has no enforcement mechanism is mostly just political show boating.