Well ksa has been supporting rebels and terror groups for years
http://www.independent.co.uk/news/w...supporting-anti-assad-jihadists-10242747.html
Why should that not be comparable to the military aid from iran?
Because rebels groups and "extremists" is an incredibly vague term ? From Damas perspective, everything outside Baath party is "extremist".
Another thing: some rebels groups in Syria are receiving weapon and money from different regional actor, from the West to A-S. They are not under direct authority, and they usually receive money from different sources, and those sources may cut the money, reduce it or raise it. It's a dynamic and an open relationship.
It's not the same as direct iranian army presence, or militia under direct iranian authority, like Hezbollah.
How is this any different from SA interfering in Bahrain and Yemen? The population of Yemen is under dire conditions, now worse than Iraq, largely due to the Saudi's indiscriminate bombings of civilian areas. Bahrain is in a far worse situation after the Arab Spring thanks to the Saudi intervention. It's security crackdowns and human rights abuses galore in Bahrain.
On Yemen i already stated my position. It's not a conflict where you have a dictatorship against it's people. It's way more complicated than that.
On Bahrain, KSA role is as criminal as Iranian role in Syria, i don't have any problem saying that.