[cyberferret]

Take your second paragraph and replace the word ISIS with "The USA". That is essentially their recruitment speech for their operatives in the rest of the world. Checkmate.

[notpc]

I can't put together a proof that we're the 'good' and they are 'bad' in some objective moral sense.

We have our vision for what we want for the world and our nation, they have theirs. It's better for us if we win.

[cyberferret]

So there has to be a "winner" and a "loser"?

What a strange game. The only winning move is not to play. - WOPR (War Games)

[notpc]

Yes, there does have to be a winner and a loser. Given that ISIS aims for a global caliphate and the destruction of the US and Israel, I sure hope you want them to lose...

[Grangar]

The problem behind ISIS isn't their numbers, or their land, or their weapons, or their tactics. It's the mentality behind it. And that has already gone worldwide.

You can kill people with violence, but an idea will only grow stronger.