One of the questions from chat asked him exactly that. His answer was that he already lives in a government-sector in Berlin where he doesn't need cameras to feel safe at home. The main argument of this talk was about his experiences when he travelled abroad (UK/US) and experienced the surveillance and intimidation.
Sure, but they were in his home. If he had cameras streaming to a server recording everything they would stop doing that at least. (Or if they didn't, he would at least have evidence of the criminals faces)
It's not clear (from the talk) if they were in his home at all. He uses a stealth key, I guess the one from UrbanAlps where the key is 3d printend outside in.