I don’t think most normal people would disagree that it’s reprehensible to tear gas nonviolent protestors, regardless of age.

I think the reason you see things like this is not because people are thinking “how DARE they gas that young girl!? I think we should only gas 18+ people instead 😠”, but they’re making the point of “these people are willing to stoop so low, that not only will they teargas innocent people, but they will even do it to a child.”

They’re not saying it doesn’t matter when it’s done to adults, they’re saying that it being done to children shows how low they are willing to stoop, past even the point of gassing adults with no ability or intent to harm them.