Well, my comment was highly abbreviated for the sake of pithiness, but US ratification of the treaty would be more meaningful than the US simply not employing landmines itself. (NB While I place all the blame on senators for not ratifying it, technically no US president has signed it, so the Senate hasn't actually had the opportunity to ratify, but Senate leaders have made their opposition clear for decades so they definitely deserve the blame I'm pointing in their direction.)

Furthermore, landmines haven't actually been a weapon that the US military has considered tactically useful in nearly 50 years, so saying that we won'ist use them (because they're not useful to us), but not pressuring other countries which may find them useful despite their horrific downsides, isn't exactly upstanding. And, the article title on HN is misleading, because this isn't just about landmines, it's about unexploded ordnance (UXO) more generally. The US, in addition to not signing the Mine Ban Convention, refuses to sign/ratify the Convention on Cluster Munitions, and has significant quantities of cluster munitions in the inventory, with an alarmingly high failure rate (meaning the munition doesn't detonate when it is supposed to, leaving dangerous UXO that only becomes more dangerous over time). So, yes, there's nuance, but honestly not enough to let US leaders off the hook for these horrors.