Do these people have a heart?

over the last few days i have been going crazy watching documentaries on foxtel. the large proportion of shows i actually watch on foxtel are documentaries. i mainly watch the history channel, crime investigation and discovery home and health. subjects tend to watch are serial killer investigations, rebellious history, empire history, royal history, and Egyptian history and shows about ivf, multiples births and super large families. i also watch stuff about world wars particularly stuff about nazi occupation.
yesterday i watched 4 documentaries about Auschwitz-Birkenau. i know i cant believe i watched 4 of them in one day either. i have seen quiet a few of them now and but still constantly shocked that it happened that people actually planned to build a concentration camp for the sole purpose of mass murder. not only did they do that but they schemed a way to deport millions of Jewish people form all over Europe to the camps to murder them. and sometimes they even traded Jewish people from the French and British. the Slovakia government actually paid the nazis $500 for each Jewish person they deported to Auschwitz. the documentary spoke to one of the Slovakian guards who has participating in the deportation of Jewish Slovakians to Auschwitz. his job was to sort to the possessions left behind by the Jewish people. he laughed about how he and the other guards had done well by being able to take home cloths and shoes and other things left behind. he thought it was funny that he and others had benefited from the deportation of his fellow Slovakians. i couldn't believe he could just sit there and laugh. if i was him i would of been so ashamed that i had participated in the holocaust, and would not be laughing about it, even 60 years later. the interviewer asked him, how he could of participated in the deportation knowing that the people were being sent to their deaths. he said he was in two minds about it, saying it was "easier" with out Jewish Slovakians in Slovakia because they were "lazy" (he laughed as he said this) but at the same time he knew that "some people were innocent among them". i couldn't believe my ears "some?" none of the jewish people were guilty of anything ekes apart from being Jewish. how could he still maintain this fact after all these years?
they then spoke to a former nazi who states he did not want to participate in the deportation and that he was stationed at Auschwitz. ( i know that not all nazis were willing participants in the holocaust and some had no choice, but if i was one of these people the stuff that went on at Auschwitz would haunt me forever if i had bore witness to it) the guard spoke about how the people were divided up once they arrived off the trains and his job was to sort through the rubbish left behind (this was mostly suitcases and other possessions brought by Jews with them) he described how the "rubbish" even included people to sick or unable to move. he said he saw a guard drag a child "by its legs and threw it in the lorry when it cried they bashed it against the lorry and it become silent" again i couldn't believe he could refer to the child as "it" like it had no meaning like he still believed what Hitler was saying that the Jewsih people were "sub-human"
the guards all said that they generally believed that the Jewish people and the allies had a world plot against the Germans and were guilty. they were asked "but children? surly children were not guilty they could not have done anything to you?" the guard said "especially children, they would grow up to be Jews in was in their blood"
looking up at my title i realise that it is ill fitting because really of course they couldnt have a heart if they still feel this way.