From the seat of his big rig, protest convoy leader Dave Steenburg regularly takes to TikTok to call for respect and calm. If he has to, he will ask troublemakers to leave the protest. “If someone gets out of line, please, don’t come,” he said Thursday as elements of the “Freedom Convoy” headed to the Vaughan Mills mall , north of Toronto. Steenburg’s TikTok page is also filled with videos promoting conspiracy theories about COVID-19 vaccines, pandemic denialism and videos promoting fictional war-crimes trials for those responsible for vaccine mandates. In late December, he posted to a call-to-action video featuring...