A lot of reasons, but one solid one is that there is a pretty strong anti-pattern in that the ones that desire wealth redistribution the most are the most likely to support gun control and/or the banning of private ownership of weapons.
Wealth inequality is not the only reason for revolutions. There are also dictatorships, human rights abuse, corruption, disregard of laws for the elite, and other fine things that might warrant the direct action.
While true, those values are highly correlated - at least in Americans, and most of the developed world - with people desiring lower access to guns for the private citizenship. Low access to force multipliers makes it much harder to spark and win a revolution against the state.
