International law gets weird. Tradition is absolutely a legitimate way for something to get recognized. That works because of Sovereignty and the intense political nature of anything between countries. So basically, if someone got an Israeli to the Hague, then the Netherlands could point at the decades of precedent for the moral high ground in refusing to release them. Whether that works depends on politics and what people think. So just because we didn’t sign the paper does not mean we can resist it forever. If the world wants to head in that direction, the best we can do is dig our feet in and make it take longer.

And no sane US president would use the Hague Invasion Act. It’s an open question if the military would even follow the order. that would require invading a NATO ally with strong defense systems tied into their neighbors. It would be a great way to obliterate our world standing in one fell swoop.