Venezuelan oil revenues have been supporting the Cuban regime, Leftist subversion throughout the Americas, and even Iranian malign activities. Even Erdogan in Turkey has been running suspicious gold shipments out of Venezuela.
The loss of those revenues will starve a lot of bad actors. A whole rogue's gallery of anti-American thugs.
Former Vice President of Venezuela, Drug Kingpin, and Iranian Agent, Tareck El Aissami:
Oh, yes, and Maduro already threatened to host Iranian missiles (with, it was speculated at the time, North Korean warheads) even before the Russians showed up. Lots of very nasty people looking for a butt-kicking.