I'm thinking of possibly ruining someone's life
Why do you need to ruin his life?
He has a camera and he takes a lot of photos. What if I were to go to a casual talk and react inappropriately in the photos that he took?
You have no right to mess up a stranger's life. You have no no business with this person, and it is disgusting to attempt to hurt him and destroy his projects like that. I hope you don't act on these urges.
What? Why did you have to go there?
Even if you feel wronged it is wrong to hurt other people. You should tell him how you feel and if they broke the law take legal steps if you think it would be worth it.