Gab was taken down last month after it’s ties to the Tree of Life gunman were revealed to the world — but it’s back up as of this weekend, which should alarm anyone who cares about public safety.

Gab, a fringe social media site frequented by Tree of Life shooter Robert Bowers, was taken down on Saturday — a great first step towards eradicating hate on the internet.

Shortly before entering the Tree of Life congregation in Squirrel Hill, Robert Bowers, a Baldwin resident and Saturday’s shooting suspect, posted a message on social media site Gab that said, “I can't...