If you want to politicize Linux and Open Source Software, go right ahead.
Stallman doesn't care as much about Open Source as he does about Free Software. The differences can sometimes seem small, but I think the latter is inherently political, as is "hacker culture" in general.
If we get a right wing government anywhere in the world, should they automatically ignore the concerns of OSS because it is seen as a front group for left wing nutters?
As a "left wing nutter", I wouldn't have too much hope of a right wing government doing much of anything that benefits common (working class) people. I think trying to get them to pass "OSS-friendly" laws would be a futile endeavour.
As for qualifications, I would suggest the same thing qualifies him to speak out against stallman entangling political views with OSS as does qualify you to speak out against him for doing it. Stallman is not on some pedestal that make him irreproachable or uniquely off limits to criticism for his comments or stances.
Of course. But he seemed to suggest that since political topics have (in his opinion) nothing to do with Free Software, Stallman shouldn't talk about them. This just rubbed me the wrong way, similar to how whenever Chomsky says something political, there are those who claim that since his most well-known works are in linguistics, he should shut up because he's not "qualified" to talk about politics.