Some comments from alt-right white nationalists on white supremacist site Stormfront.
"I have zero sympathy for her. Good riddance! Once less SJW moron in the world."
"How satisfying! ... A brain-dead liberal White girl named Heather has bitten the dust "protecting our freedoms"... Good riddance!"
"There is no doubt Jewry has everything to do with the chaos, the man arrested for running those people over in unquestionably Jewish."
"The woman was in her mid-30's with no children or husband and was attending an antifa rally mainly with early 20-somethings and teens. She sounded like a real winner for sure."
"That was the most awesome video I have ever seen. It fills my heart with pure joy. The Dodge Challenger used to be one of my favorite cars, but now it shall have a special place in my heart forever. Sublime."
To his credit, I did find one post by a member pointing out the sheer lunacy of calling this self-defense, noting that nobody his the killer's car with anything until /after/ he plowed into the crowd. At a high rate of speed.