They have the support of the military forces. So rioting doesn't work. It just gets you killed on the street with no repercussions for the government.

Also, the word "leader" implies that this is a legitimate democracy, which is not. Venezuela has an authoritarian corrupt government at best, a dictatorship at worst.

The populace is largely disarmed.

The reason the leaders of Venezuela still have their heads is that they first won free and fair elections and they then proceeded to do the will of the people.

The support of the military and by being a not so well known narcostate. If the situation would come to light properly maybe then we will see massive change. I am surprised nothing is done about it honestly.

The government still has the support of an enormous number of people, mostly from the largely non-white working classes, whose economic and political interests were trampled on by the pre-Bolivarian governments and who are naturally suspicious of the right-wing agitators currently attempting to overthrow the government with the backing of foreign powers

It's not always that easy. Look at what's going on in the US right now for example...