There are also many Venezuelan civilians who still support the regime. These people would presumably also have guns.
I'm not saying you're wrong, but I hear the theory often that armed civilians can't effect positive change, and I don't know where the certainty comes from. Surely it's a longshot, like all violence is because of the ensuing chaos, but it seems plausible when the people at least remember something better.
Or the successful ones that just lead to another autocracy?
For instance, it's hard for me to imagine actually blocking food aid from coming in to hungry people. The people waiting for that food may get desperate and violent. If enough are armed, the ensuing violence and chaos might topple the regime.
So Maduro might have been worried enough not to block the food aid if more Venezuelans were armed.
Unlike my idiot Maduro-supporting neighbour with his stupid, socialist ideas - and violent tendencies! I would prefer him to be un-armed.