We don't destroy nations by leaving them (which we haven't done in Syria's case; there are still USA troops fighting there [0]), we destroy them by occupying and slaughtering in the first place. Keep in mind that the "gas attacks" were staged false-flag this-is-how-all-our-wars-start bullshit, which overruled-from-top OPCW investigations made clear. [1] Calling oneself "extremely anti-war" while parroting military-industrial complex submarine interventionist propaganda is fairly ridiculous. Killing more children in Syria wouldn't have saved the lives of Syrian children.
[0] https://thegrayzone.com/2019/11/07/max-blumenthal-on-baghdad...
[1] https://thegrayzone.com/2020/04/28/opcw-insiders-ltamenah-ch...