Feel how you want to feel about this, but the reason why people that actually give a shit about the law are not happy with this is because we're supposed to be the country that actually follows the laws we're expecting everyone else to follow. I don't care if Venezuelans are happy about this or not---that's not how the law is supposed to work. We'd all be happy if cops executed baby murderers, but that's not how things are supposed to be done.
Maduro being illegitimate didn't grant the US the power to unilaterally unseat him by military force.
And when we stop following the rules, then it completely obliterates any reason for anyone else to...unless, they want to be "liberated" as well. It's a dangerous precedent to set, and other powers can use similar justifications to countries in their sphere.