This isn’t much different from when libs were crying about South Africa not arresting Putin.

Arresting a sitting head of state sets a dangerous precedent that no country wants to set. It’s part of why the ICC is a joke in the first place; nobody’s going to enforce these rules except the people who have the power to escape the consequences, like the U.S. for example. It’s unrealistic to expect anybody to follow through on these “arrest X leader” threat. There’s no incentive to do so and every incentive not to.