Google needs to know everything about you before it can set your thermostat

[gratuitous]

4. Nothing to worry about

Don't be alarmed. Google will be mining so much information from all its users they couldn't possibly sort through it all to target just little old you. And I'm confident their security systems will be equal to the task of defeating any snoopers with bad intent. And surely your data will be sufficiently protected that Google won't just hand it all over to any law enforcement agency that asks, unless they have a really good reason, like your jealous cop ex-partner wants to spy on you.

Think of how neat-o it will be to come home to a warm house!