After the spell didn't work, he semidied
But I think using a spell to combat an infant was stupid in the first place

You can say that it was about not realizing the power of love all you want, but I still think that Voldemort's true undoing was the fact that he always had to do things the flashy way instead of the smart way. He is the only person who would ever seal his own soul inside priceless historical artifacts that have common elements linking them and are therefore completely possible for a 17 year old to track down.

Just shove some soul inside a rock or something and disapparate that shit to Antarctica, Voldy. I guarantee you that you would have won the war.