If I remember rightly, the argument for not supplying weapons to the communist bits of the French resistance went something like this:
Everyone can get hold of a knife. If you can get a knife, you can take a gun. If you can take a gun, you can take a car. If you can take a car, you can block a road. If you can block a road, you can stop a tank and take it.
The trouble was that it assumed eveyone was quick, strong, ruthless, well-trained, and had no problem using a knife as an effective weapon in the first place. What happened on the ground was that a lot of people died, but some resorted to homemade explosives and contented themselves with guerilla tactics to disrupt infrastructure.