I understand his motive now and it will shed negative light where, it will ironically do great harm to innocent other similar individuals. News media has understandably shied away from posting much less committing to the story line if true. The killer had apparently been on "The Voice" tv show and then gave interviews. One needs to understand there are extreme groups in both the Left and Right where there are plenty of members that have the capacity to do the same unless we United States of American citizens change how such groups as RAF and Antifa and Proud Boys and Oath Keepers are allowed given free speech to have free run in media, indoctrinating those weak minded.
I don't know anything about the victim's' politics or who he was. But the below taken from news media says much to this person with unusual Christian beliefs about another Christian that has obviously also studied The Bible:
Moments before his assassination at Utah Valley University (UVU) during an event that was part of "The American Comeback Tour," Kirk spoke about the Bible. A man who was always open about his connection to faith, Kirk reaffirmed his belief in Jesus Christ, referring to Corinthians verses.
"It’s not just intrabiblical evidence, but extrabiblical evidence that Jesus Christ was a real person. He lived a perfect life, he was crucified, died and rose on the third day, and he is Lord and God over all," Kirk said while sitting under the very tent where he would be fatally shot. 
