Anyway another group pressuring politicians to leave guns alone can't be bad, right?
Oh, it most certainly CAN be a VERY BAD thing. It depends on the "social acceptability" of the group. It is a very real "guilt by association" thing. WE already are the victims of a degree of that, just by being gun owners.
IF the new group ALSO espouses radical, unpopular views about other subjects, along with telling politicians to leave guns alone, there is the risk of serious PR damage to our cause.
When everyone who owns a gun, and thinks people have a right to, are put in the same "basket of deplorables" as "NRA murders", we might not have a lot of credibility left to lose, but we still have some, and a radical fringe group (in any direction) fighting gun control risks linking fighting gun control with the rest of their radical agenda, in the public eye.
That would do damage, because of the inevitable (and already happening) linking us with the radical group, because we happen to agree on ONE thing.
So, while in principle another group fighting for gun rights is a good thing, it is possible that the "wrong" group could do more harm than good.