No. I think because of the times back then, it was different. The trouble he got into was just "normal" stuff back then I think. Like, he wasn't doing that stuff by himself. There were other kids as well. So, Boo wasn't alone. And with the thing about Boo stabbing his father, that was a rumor. The reader never actually knows for sure if it is true. A lot of what Boo Radley is perceived to be is made up of rumors by the town. So, no, I don't think he should have been put in a mental hospital.