I think the majority of Americans have bought into Venezuela being some kind of a narcotraffic denial police action and that Maduro is a narco kingpin.
Also, Maduro has offered his country's oil on a platter, exclusive JVs with American big oil, with of course the right revenue sharing scheme given that it's their oil. That's not good enough for the White House, they want someone who will sell out their own country for a mansion in Miami, a nice Cayman bank account and maybe even a Nobel Peace Prize...
It's a pretty old story, see Iran in 1953 and the overthrow of their democratically-elected president who wanted to nationalize their oil, aka Operation Ajax, led by Teddy Roosevelt's grandson Kermit.
en.wikipedia.org
This is not just unethical, it is also unrealistic. Maduro is not going to be overthrown, all that will happen is that the country will fall further into poverty, and millions of Venezuelans will emigrate.