i disagree. it shows that you're aware of and can acknowledge the fact that some people have flaws. the problem with a lot of arguments on this matter is that a fair number of them are written by people who simply refuse to believe that "xxx group" can do anything wrong, whether that group is self-DXers or anti-self-DXers or whatever.

it shows that you're aware of both sides of the situation. the fact that you can acknowledge the unsavory people doesn't hurt your argument -- it HELPS, because it proves to your audience that you are aware of both sides of the issue. because of that, no one can accuse you of being too stupid/in denial to know what you're talking about.

all you need is one sentence: "i am aware those people exist, and they're in the wrong, but these people also exist and maybe we should consider them a bit more."