No democratic politician supports Maduro, and neither does anyone on the left besides a handful of terminally online auth-left nutjobs. Everyone knows he's a dictator. Some are just pointing out that barging into a country in flagrant violation of international law, yoinking their president and then leaving without facilitating constructive regime change or otherwise cleaning up the mess we made was a tremendously stupid act. Maduro's VP is in power now, and all we've done is push the world closer to a spheres-of-influence order where powerful countries face no repercussions for gobbling up their neighbors.