In most instances TRPs are issued for very short periods of time for very bona fide reasons to enter the country. An example might be an entry to attend a funeral in Canada. Many of these are issued at the border to Americans who have minor criminality convictions, such as driving under the influence. The officer makes a risk assessment with the individual in front of them, who's been very transparent about their criminal history, and renders a decision around the issuance of a permit. Very few are issued in relation to serious inadmissibilities, such as human rights violations. I think you cited two permits issued in those circumstances.
On October 24th, 2016. See this statement in context.