His father died shortly before in March of 04, his girlfriend had broken up with him. His business had been screwed and he was upset. Plus it was also the beginning of summer and he couldn't do his favorite thing after welding which was snowmobiling. He was going to kill himself alone in his garage or after making a point. He chose the latter and even tried to sell the bulldozer before he modified it.
He was a religious person and didn't want to kill anyone in my opinion.
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