One reason for so much pressure is oil prices are rising and external forces want things changed before that happens. Thus the talk of US invasion.
This is in contrast to the US-backed military overthrow of the Honduran government, which has been slaughtering its political opposition. In fact, these are many of the immigrants on the US border being discussed. The western governments back the military and post-coup governments on that case, which has been much more bloody.
Was/is Chavez/Maduro credible? I'll leave that up to you to decide.
The sitch down there is the govt's own doing. Nationalizing, expelling and enacting policies which drove out Industry SMEs ensured that the country would slowly but surely go downhill.