It’s almost certain US/ Israel/ Saudi have supported the Iranian opposition. They have a long history of it. That opposition is genuine and widespread also.
And, yes, they’ll deserve a lot of the credit if this looks a success in hindsight and much responsibility if this goes badly.
Very few Iranians are Arabs, so am a bit confused by your comment, but sure:
In the past decade Tehran has been by far the biggest killer of Arabs too (Yemen and Syria mainly). Hundreds of thousands of them killed in proxy wars fueled by Iran.
This latest attack may well lead to chaos. But Tehran is a bloodthirsty aggressor that has been killing its own and other peoples by the hundreds of thousands for decades.
They are the serial abuser here. The question is whether and how they can be stopped without even worse consequences.