They're full indoctrinated with an ultra-racist mindset, quite similar to how the Nazis indoctrinated a large part of the German population.

I mean, it's extremelly usual to hear somebody from the Israeli government say that "Palestinians are violent" (not Hamas, Palestinians) which the very kind of group blame myths as the Nazis spewed.

And then there is the whole "human animals" from an Israeli minister. Consider what kind of environment there must be in a country for an actual government minister to think it's fine to describe an entire people like that.

True Evil is not the cartoonish "being Evil on purpose because you want to be Evil and knowing you're being Evil", it's this shit: reasonably normal people (possibly but not necessarilly low on empathy) who have been brainwashed (in this case, probably since they were children) to see entire groups of people as "members of a group", not as persons, belive some "we have to get them before they get us" rationale which goes unquestioned and has been stretched way beyond any logic, and whose view of those "group members" has been so dehumanized that "putting then down" like one would do a rabid animal is not only acceptable but actually a point of pride.

Indoctrinated people like this have no shame in displaying their acts of barbary because in their minds such actions were good and righteous actions of putting down rabid animals "to defend ourselves from them".

So for them to parade this, if only for each other, makes all sense: they don't see their actions as Evil, quite the contrary, and they have pride in them and know many/most others in their country think just like them and will look up to them when they see what they've done.