The kid was a big supporter of the 2nd Amendment. That doesn't sound like a Democrat to me. More info.
"Crooks tried out for the school’s rifle team but was turned away because he was a bad shooter, said Frederick Mach, a current captain of the team who was a few years behind Crooks at the school."
"Images of Crooks’ body reviewed by AP show he appears to have been wearing a T-shirt from Demolition Ranch,
a popular YouTube channel that regularly posts videos of its creator firing off handguns and assault rifles at targets that include human mannequins."
Investigators hunt for clues about what may have driven the 20-year-old shooter to try to assassinate former President Donald Trump.
apnews.com