How do you not? Well, sure, you don't have authority, but that doesn't mean this discussion doesn't pertain to you. It doesn't who you main or who you don't, it effects you either way.
That is like saying that only Meta Knight mains should participate in the discussion of his ban. That's silly talk. Meta Knight effects the whole cast. Whether or not you play him, or even play against him often, doesn't make this exclusive. It is a more extreme example, but it's true.
I don't play any character that can be infinite by King Dedede, but think of it this way. I main Marth, okay? Meta Knight is my worst match up flat out. Now, the more Meta Knights I have to deal with, the harder a tournament will be in order to win. Donkey Kong is a character that, potentially, can give Meta Knight a hard time. He is not a sure fire counter, but he certainly does better than Marth. Now, with the infinite in place, Donkey Kong is less likely to be played, and thus the chances of Meta Knights use increases. If the infinite is not in place however, Donkey Kong is no longer threatened by King Dedede, and Meta Knights may have to be forced to switch to another character, such as Snake.
The point I am trying to make here is that these infinite skew match ups in such a way that it drastically effects the match ups for the entire cast, because of how this one character makes five others unplayable. One way or another, drastic or minimal, it will effect you as long as you play.
I say the most important credentials who could be in this debate are the TO's themselves. They're the ones who have to deal with the issue at heart.