Olivia Krolczyk has been on a mission since Charlie Kirk’s assassination, scouring social media to find those celebrating his death — then alerting their employers. The 22-year-old takes credit for getting hundreds booted from their jobs.“It’s not cancel culture, it’s holding people accountable,” she said in one video defending her actions.Ms. Krolczyk, who has gained a following opposing transgender athletes participating in women’s sports and has appeared as a speaker for Mr. Kirk’s Turning Point USA, is not alone.Furious at the nastiness and, in some cases, full-on embrace of political violence, conservatives are harnessing public pressure to go after targets...