Hitler started by imprisoning those suspected of being in opposition. First concentration camps started right after he took power. The estimation is that they locked 50,000 of political opponents arresting 100,000. Purge of SA happened a year later.

In 1933, right after getting power, Jews were excluded from civil service, their numbers in schools were limited and a year later they could not be actors. The restrictions came in quick and were felt a lot by their targets.

So, this extract kind of underplays the beginning of it all. It was violent from the start.