Saudi support for rebuilding Syria isn't as cut and dry as you think. The goal of the Zionist-Neocon Axis has always been to take out any rivals of Israel. That is why they're always harping on about WMDs, and took out Iraq and Libya, and by destabilizing Syria their job is done because they set it back by a century and rid it of its military and WMD capabilities to rival Israel's hegemony.
But what is the plan next? Their future target has always been Iran and Lebanon, but also Turkey. The Saudis are part of the Zionist-Neocon Axis. They were hoping to remove Erdogan from power just a few years ago but it was foiled. But don't think you were left off scott free. Turkey will always be their target. Saudis, Emiratis and Israel do NOT like the idea of a strong Turkey to challenge their regional and political hegemony.
They are at your doorstep. Keep that in mind.