The phrase, "the right side of history" makes me chuckle. Any objective writing of history does not take sides. So Mr Yakabuski self-outs himself as a propagandist.

According to other media sources, Trump ended the CIA training program after 2 events;
1. He was shown a video of CIA trained mercenaries (lets call then what they are) cutting off and displaying a teenage Syrian boy's head.
2. The incident at the Jordanian military airport where three US servicemen (aka trainers) were shot by a Jordanian guard. It is was visible on the base security video.

Also, in the same time frame, the US has established 10 small military bases in northern Syria close to the Turkish border. Illegally of course and likely to "manage" the involvement of the Turkish forces against the Kurds and perhaps to direct fleeing ISIS forces in Iraq into Syria.

There is no valid comparison of Rwanda to Syria. The US playbook in Syria was more like Libya, except without the NATO aerial bombing support.