According to a review of The Jacksonville shooters Reddit profile he was a Anti-Trump resistance member who called Trump supporters Trumptards.

The Gateway Pundit:

David Katz’s Reddit page is littered with anti-Trump garbage.
Via Ian Miles Cheong:

BREAKING: Jacksonville Landing is a Gun Free Zone

Share Your Thoughts

We have no tolerance for comments containing violence, racism, profanity, vulgarity, doxing, or discourteous behavior. If a comment is spam, instead of replying to it please hover over that comment, click the ∨ icon, and mark it as spam. Thank you for partnering with us to maintain fruitful conversation.