What harm does public data have to you? Couldn’t one just ignore the ads? You can’t see anyone watching you, is public data good for public records? (I’m just curious). I know this sounds weird but is public data good for historical preservation and knowledge increasing the importance of the individual? And does public data lead to better products?
And those people sometimes shoot innocent people with guns, but that doesn’t mean that people like Malcolm X shouldn’t have one to protect themselves against that.
Just because something can be misused doesn’t mean it should be illegal to use it properly. Often the improper use itself is criminalized and making it illegal just tacks on an extra charge that people aren’t worried about by then, because they already have murder charges to fight.
To add: the FBI was asked by congress to justify project prism by telling just one example of something they stopped with warrantless mass surveillance. Turns out, they had none, the case they provided they’d have been able to get a warrant for the guys and they were put on the FBI’s radar by other means, not the mass surveillance. They don’t even stop anything with it.