A lot of users prefer DRM-free distributors like GOG, precisely because they reject DRM.
Percentage of those who reject DRM (i.e. wouldn't buy any goods with DRM) can be actually quite high as some studies show.
I know all of this like the next PC gamer. That said Steam has a lot more users than GOG and I use GOG and like GOG but not because it is DRM free, it is because they have the game I want at the price I want. That said, I know you are right there are some like that, as you are, there is no argument there.
No one is changing anyone's mind today, you will always be in fear of the "gotcha" for me to learn I will have to be "gotcha'd". I do happen to work like that in many things in life. While you tend to take the opposite approach perhaps. There are beni's and negs to either approach in life.