Sigh... I forgot two wrongs do make a right.
You should care, because you want to improve the level of discourse out there. You should care because you make yourself look like a fool shouting invective to anyone of reason. But maybe more pragmatically, you should care because, if you cared to read the article, being hateful and abusive only entrenches others in their belief- which means if you care about your beliefs spreading at all you should do so in the most efficacious way possible- which means not shouting at each other.
But I suppose if you just want to feel like a big man having a conversation of one while shouting at everyone else about how right you are then that is your business. A bad business, but your business. You can still be respectful while reproving someone.