Well the USSR had sufficient control over it's sphere that it didn't need to "interfere" per se despite the norm against colonialism.
In the 1950s Kruschev used Anglo-French intervention in Egypt as an excuse/justification for not withdrawing from Hungary.
The Soviet Invasion of Aghanistan was opposed by the entire postcolonial world, including post-colonial states like India and Pakistan. The Soviet defeat at Afghanistan then may have led directly to the "Sinatra doctrine" which enabled the whole of Eastern Europe falling away.
As for the US, it could reasonably be argued that Latin America would be better off with more US interference for the same reason Africa was better off under colonialism.
Africa has fallen behind the rest of the world in a way that Latin America hasn't.
SIAI benefactor and VC Peter Thiel has an excellent article at National Review about the stagnating progress of science and technology, which he attributes to poorly-grounded political opposition, widespread scientific illiteracy, and overspecialized, insular scientific fields. He warns that this stagnation will undermine the growth that past policies have relied on.
Noteworthy excerpts (bold added by me):
In relation to concerns expressed here about evaluating scientific field soundness:
Grave indictors:
HT: MarginalRevolution