Jesus (and Buddah) were right in saying that you should love all things, including your enemies. On a spiritual level that is the most sensible way to approach life. Stop to sniff the flowers and love them! On a personal and individual level, that is all there is.
Yet on a biological and species level it is more than likely that Hitler was right. If one desires that humanity goes on and prospers such ruthless policies as elimination of the disabled and weak make a great deal of sense. Post WWII the world we have inherited is worse than ever. Aging populations, ever increasing numbers of humans and finite resources are all spelling doom. At present we have multitudes of people in nursing homes, many with dementia. In the near future (unless humanity entirely becomes enlightened) I can’t see the rich and the greedy sacrificing anything for these unproductive individuals. I suspect it will be a case of “Arbeit mach frei” (Work sets you free). You guessed correctly, that is a slogan of Nazi Germany.
I don’t have to dream very hard to imagine a coming world where people who no longer work are disposed of. No, this is not a world created by Hitler. This is the world that prospered after his defeat. It is more than just for amusement and the occupation of time that the elderly continue to work. It probably makes them feel safer.
After all, if humanity doesn’t quickly get its act together, both from an individual and species perspective, Nature almost certainly will remove us, one way or the other.