When it comes to political ideology invoking a no true Scotsman is not always invalid.
As an example, as a leftist I can say: “A socialist revolution without social justice is not socialist”. Yes, this is a no true Scotsman fallacy, but here I am merely disavowing a subgroup of people that might share my economic believes that workers ought to take over the means of production, but fail to see that the racial injustice in our economic system is part of the problem. In my view, if you don’t see that, you are not a real leftist.
As an example, as a leftist I can say: “A socialist revolution without social justice is not socialist”. Yes, this is a no true Scotsman fallacy, but here I am merely disavowing a subgroup of people that might share my economic believes that workers ought to take over the means of production, but fail to see that the racial injustice in our economic system is part of the problem. In my view, if you don’t see that, you are not a real leftist.