> one must in the interest of humanity seek to understand exactly how that transition happened.

I suspect Martin-Niemöller had some insight into how this happened:

First they came for the communists, and I didn't speak out because I wasn't a communist.

Then they came for the socialists, and I didn't speak out because I wasn't a socialist.

Then they came for the trade unionists, and I didn't speak out because I wasn't a trade unionist.

Then they came for me, and there was no one left to speak for me.