I think you're going about this the wrong way. The parent commenter already indicated that they're getting emotional over this topic (assuming genuine indignation).

I sincerely doubt implying they're "white knighting" is going to set the discussion on a better track.

In other words, I think comments like yours are also responsible for why discussions on these topics are so unproductive.

See sibling comments to yours for an idea of how your comment could be improved next time.