"Surely Maduro is a tyrant, like Chávez, and without a doubt they are the main culprits of the economy, social and political crisis."
What makes you so sure of that? Both of them were voted in by the people in elections which were deemed to be exceptionally fair by international observers.
The US didn't send observers so that they wouldn't have to admit to this fact.
Also one of the main reasons for the bad economic situation has been due to sanctions illegally imposed mainly by the US.