It is true. When I read the laws that are being proposed nationally and locally in the state I live in, I realized there's a real chance that my right to own a firearm is under a real threat. And to illustrate that, I have before my eyes a number of localities where this right is already destroyed. So my choice of giving the money to the NRA was obvious and easy to make.
The choice of giving money to, say, EFF, is also easy for me to make, but I couldn't point to a specific and targeted threat in this case, it is more of a feeling that things take a wrong direction, which is not as mobilizing.