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That's just your opinion, not fact.

Eric Cartman is that you?

I.e., an appeal to authority

That line of reasoning ... everyone in this thread is now dumber for having listened to it.

Seriously - appeal to authority is a fallacy, unless it's an appeal to an authority that I happen to agree with? It's hard to take you seriously.

Instead of repeating that they are legitimate, you would've gotten further by saying Human Rights Watch has been around for X years, has reported competently on Y matters even when suppression was attempted by Z country. Their membership is made of A, B, C and this is why you should trust in their data collection as a source that we can use in casual discussion.

Right now, you're basically asking people to trust Human Rights Watch because you trust them. But if people don't trust you, why would they trust your word on what sources are legitimized?