Apologetics is essentially “defending” something as opposed to say proselytizing (in the example of Christianity). It’s frequently used for indefensible topics like rape apologists (the type to suggest the victim was asking for it or could have tried harder to say no) or Nazi’s (the usual propaganda). Christian apologists tend to hand wave or ignore the atrocities because “god is an absolute “good”” therefore anything he does is by definition “good” and us mere mortals can’t understand the divine plan. Babies dying? God is good. Babies dying and going to hell because they are unable to accept Jesus because they literally are unable to understand the concept? God is good.