If your trying to create peace in the Middle East
(NO you'll only make it worse killing the dictators there they are what creates meta-stability in that chaotic environment destroying them creates a serious power vacuum where more radical elements moderated by these dictators can now thrive in)
A lot of the dictators there are in power because of the support of the west. And because the west killed or helped them kill the moderate forces. And topple democratic movements in several countries. Peace in the middle east is possible if we let it happen. But that would interfere with the west trying to control the world.
Not at all in fact US policy is to have those dictators destroyed not supported, if you were to compare strategy it would be similar to putting up Puppet Governments in Latin America in the 1970's like Pinochet to keep them under a tight leash instead of uncontrolled elements like the Dictators in the Middle East unfortunately they discovered they were far less worse than the Extremists.
Lets look at Libya the richest African Nation prior to their revolution with a solid infrastructure system and large projects like the Great Man Made River which would address Libya's water problems for decades to come, it was peaceful if tense under that dictatorship and the relationships between feuding parties under Gadaffi were under control now we just see a mess as the moderate elements were wiped out and ISIL came into the power vacuum (Islamic State of Libya), I'll concede Gadaffi funded terrorism as a way to keep the element in check and stabilize the country but we can see that compared to the funding they can acquire now and the land they gained that was a pittance to keep the region in check.
Russia is supporting Syria and Basshar Al Assad the West is trying to wipe him out and remove any role he has in Syria despite the problem that is ISIS putting him as an even greater threat priority wise, while he is a dictator and crazy his dictatorship kept Syria stable the power vacuum that has emerged is completely due to US intervention that allowed them to gain territory (Islamic State of Syria) were a major part of the Rebel elements the US gave weapons to in the Arab Spring.
Iraq - As everyone knows now had no Weapons of Mass Destruction but it was used as a major reason to invade the country and destroy Saddam Hussein along with 9/11. Prior to that historically there was the Shah but they haven't really had much influence their since the Iranian revolution of 1979.
Iran - Under Obama trying to make a partner there and peacefully disarm nukes then do a Gadaffi in the future, under other governments particularly Bush trying to destroy the country economically through boycotts, starving the people and sabotaging their nuclear abilities to keep Israel as the only Middle-Eastern Nuclear/Non Nuclear power.