Does the Koran say that "infidels" should be extinguished?

No!!.

Koran 9 5 Kill the pagans wherever you find them. Seize them, harass them, and lie in wait at every ambush

Infidels: the non-Believers who fight Believers. in that case, yes

Fight in the way of Allah against those who fight against you, but begin not hostilities. Lo! Allah loveth not aggressors. (190)

2:190

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look for yourself:

Excepting those of the idolaters with whom ye (Muslims) have a treaty, and who have since abated nothing of your right nor have supported anyone against you. (As for these), fulfil their treaty to them till their term. Lo! Allah loveth those who keep their duty (unto Him). (4)

9:5 connected with 9:4

Then, when the sacred months have passed, slay the idolaters wherever ye find them, and take them (captive), and besiege them, and prepare for them each ambush. But if they repent and establish worship and pay the poor-due, then leave their way free. Lo! Allah is Forgiving, Merciful. (5)

No. Muslims prefer to use them for slaves, sexual partners and for revenue like they've been doing to Orthodox Christians for ages--especially in Egypt. If they killed us, they wouldn't be able to do all of that to us.

No. And all the verses hate sites bring are taken out of context.

Learn to spell. It's Korean.

I hope yes.