Saudi Arabia and other arab nations are still flooding the market with cheap oil, Their most likely intent is to damage the more expensive oil production (e.g. shale, oil sands) in the US and elsewhere. The impact of lower gas prices is multifold. Not the least of which is the shut down or curtailment of domestic production and the layoffs which will accompany this. Lower prices also result in lower taxes collected which, in turn, affect the budgets of cities, counties, states and the Fed.
While the consumer (you and me) are tickled with cheap gasoline and heating oil, there needs to be a reasonable balance. While we do spend our "extra" money saved from the lower gas prices on other stuff, the domestic economy, and , indeed, the international economy (the whole world is more financially interconnected than you may believe) are best served with balance and predictability. Turmoil is not a good thing for anyone. Unfortunately, the middle east oil producers don't share this concern, and only pursue short term goals that benefit them only.
Your question is quite complex and the above is a far too brief a discussion, highlighting only some points that are reasonably understandable, but in no way comprehensive.
Suffice it to say, that the arab oil producers do not have anyone else's interests at heart.