The policy that led to a collapse in oil production in a petro state? The policy that led to an economic collapse so severe that 20% of the population has emigrated? That's the policy you call defensible?
You mean due to the collapse that the United States engineered?
The Saudis did it in the 1970s. It's a great policy.
Where it failed is that Venezuelans are an utterly corrupt people lacking any sense of nationalism or patriotism.
That was the policy that allowed him to build a social welfare state for people tired of being exploited. Famine decreased, life expectancy increased, and the HDI became high. Unfortunately, this ended when the country was sanctioned and embargoed.