Another incel forum member wrote a passionate defense of rape and slavery: Taking female slaves has always been a normal part of human history, when enemies would fight each other the winning party would take female slaves and distribute them among the fighters. As an incel you were rewarded in history when joining an army, you would raid towns and villages and took female slaves for yourself and make babies with them. History had place for incels, incels in the Roman or any other empire had better options than we have today.
If you think slavery and treating women like subhuman objects is "normal," I wish you a very die. I swear to god if I met any of these men on the street I would kill them on the spot :)