Is it normal to try to hunt someone down over an umbrella theft?

Hey,
call me Ahab, because I obsessively hunt things apparently.

Today I was at the university library, it was a rainy spring day; lots of cloud, lots of grey. I placed my dad's old wooden handled umbrella against the wall, next to the other umbrellas, out of courtesy to the staff more than anything else.

I climbed upstairs and got to work on my studies, French if you were wondering. When I came down the library stairs, I walked over to grab my umbrella. It was gone.

I was confused, I asked the staff for CCTV footage. The security team saw nothing, although there are cameras near the location. I did the right thing and checked all the lost and founds on campus. Nada. I was soaked, and thoroughly pissed off. It was an annoying, teasing rain, spattering my glasses and hurting visibility.

I moved from building to building and class to class, I checked every nook and cranny of the library, all looking for that self-entitled stain who stole from me. I scrutinised every umbrella I saw, and then I scrutinised them again. I walked into empty and full classrooms, with semi-prepared excuses.

I was so mad, but I was driven with a single minded instinct: I even followed somebody with a similar umbrella, but I lost him.

When I gave in, I went home. Two people stared at me at the trams: I think they were scared, because I was frowning a lot.

I am not an aggressive, angry, or violent character. I have never started a fight. I am not a sociopath. But I spent 2 hrs in cool, calm fury searching for the individual responsible. In a way, it sounds like a small thing, the umbrella. But I've always had a hang up about allowing the things of my parents to he lost or stolen. What else will there be left after they've gone?

Have you ever become this obsessed, this single minded over a seemingly unimportant thing?

TL;DR: Some fucknugget stole my father's umbrella. I tried to find them down for hours, irrationally as they were surely gone. Are you this crazy?