I think that in moments like those (visiting a site with so much historical and emotional weight) is when we realize the great limitations of language.
Wise words. Every person's role, thoughts and actions matter.
There will not be cruelty of this magnitude committed is there are not people willing to follow immoral orders.
Words are never enough and with these kinds of things, almost irrelevant.
It doesn't happen over night, it is a slow systematic process that if one isn't paying attention, feels natural.