Earlier quoted context omitted.
Is anybody claiming otherwise? It seems pretty obvious that someone there messed up majorly for a long time.
The people who barricaded the Venezuelan embassy when there was an attempted coup against Maduro for one. There is a big ideological drive to show that communism works, and as such all the problems Venezuela faces are just imperialism at work (In their argument).
People are opposed to regime change because the US government has a long history of destabilizing foreign governments in deference to US capital interests. It's unlikely their motivations are just, especially as the people involved were responsible for some of the worst atrocities in Southern American governments in the 50's-90's.
Furthermore, applying economic sanctions hurts the material conditions of poor Venezuelans without significantly affecting the corrupt government. This is evidence the US does not have a strong interest in helping poor Venezuelans, but primarily forcing regime change to a government more amenable to the interests of US oil companies.
If the US was truly a force for good, wouldn't we see the same pressure on the Bolsonaro regime in Brazil? The story is similar, a corrupt rise to power achieve through unjustly jailing political opponents. If you doubt this, read Glenn Greenwald's reporting in The Intercept.