Devil's advocate..

[Fidel_Castronaut]

It depends on what you mean by 'right' and 'wrong'. If by right you mean an intolerant, racist, xenophobic, patriarchal, oppressive, tyrannical, theocratic Orwellian 'state' that murders everyone and everything that even looks like it might be even slightly opposed to its very narrow and exclusive mission and which would also set back human progress economically and socially several centuries, then IS is the way to go.

On the other hand, if you don't want any of that, it's probably not for you.

You're guessing my opinion, just give me your opinion.
In a democracy, there's a group of people that have more kids than another group... so they win.... doesn't matter whether they chop hands off or stone women to death does it?

There is no right answer. In your hypothetical above, ceteris parabis, yes, they win. But rarely are things as such.

But FWIW, in a society akin to the one developed and run by organisations/peoples like IS, you have a majority of people wanting to escape tooth and nail from the society to which they have been subsumed. They are de facto slave a even if they can't state it out loud.

In my society I can announce that I'm a slave and criticise the powers that be without fear of, for example, getting my hand chopped off in the process.