If it was based on existing US law then nobody in the US lost out on anything by failure to ratify. The treaty presumably would apply in other other countries

If it was based on existing US law then nobody in the US lost out on anything by failure to ratify. The treaty presumably would apply in other other countries that ratify it. Also, the danger is less what it would do now versus how the treaty could be interpreted in the future. Also, while HSLDA mobilized their members against the treaty they hardly have the political clout to kill a treaty in the Senate. At most they gave a few Senators who were on the fence reason to delay consideration.