The US has never perfectly followed international law, but it did generally follow and enforce norms against overthrowing a leader or regime without assuming responsibility for the consequences. In Venezuela, Trump kidnapped the country’s leader and then took little to no responsibility to nation-build, just demanding oil from the new leader if she doesn’t want to meet a similar fate.
The Trump administration sometimes appeal to spheres of influence, saying they shouldn’t have to ignore a threat in this hemisphere. This is dangerous because it justifies other great powers doing the same thing and makes it harder for the US to rally a coalition against such actions because the US looks hypocritical. If the US can change Venezuela’s leader at will, why can’t China do it to South Korea?