Literally all of what you said is factually incorrect. The shooting took place on public property and his father lives in Kenosha. Additionally, while on the stand during the trial, Gaige Grosskreutz, one of the people who was shot, testified that Kyle didn't shoot until he pulled out his own gun. Lastly, the gun wasn't illegally purchased. It was his friend's legally purchased gun, and it was legal for him to have it, which is why the judge dropped the gun possession charge (link, which you can find a million articles online, such as the one I just linked, discussing that fact.