It was exactly the same thing.

Uh...no.

The OP was referring to how the National Socialist Worker's Party arose, and seized control. You're talking about the aftermath. Two different, if related, things.

For the second to happen (industrial genocide), you have to have the former (overthrow of democracy by an authoritarian ideologue supported by a cult of personality). So you were getting ahead of yourself.

Not that democracy doesn't have its blemishes (to put it mildly). The slaughter of indigenous peoples (native Americans), the rounding-up of specific ethnic peoples (and confiscating their property, putting them in camps surrounded by guard towers - like Manzanar), the systemic deprivation of rights solely based on ethnicity (black people since forever). And that's just in this country. Other democracies may have had other issues during their history, and maybe even today (Israel pops to mind, and their treatment of the Palestinians).