wheter we like it or not, and having to work with what you have to prevent bigger problems.
You should have used "I" here not "we". Syrians don't want to have a terrorist organization most of whom Turks backed by the US regime rule over them and we don't want a terrorist organization to have any kind of power in our neighborhood because it means we would have to endure terrorist attacks, suicide bombers, etc. if we allow that kind of tumor to exist.
After so many years of war, you cannot pick and choose as you wish, but you certainly need to give enough space to have some peace and stability in the region. There is no point in trying to solve Siria by further escalating tensions - particuarly now that Europe and the US have bigger things they need to deal with.
I wonder if you would say the same thing if for example Russia had installed a terrorist organization similar to al-Qaeda in Ukraine. Whether you'd tell Ukrainians and Europeans to "accept the rule of terrorists" in their region because "there is no need for further escalation"!
Neutralizing terrorist organizations is not called further escalation, it will be end of escalation. The actual escalation happened a couple of years ago when the US regime decided to train these terrorists. Today that tumor is showing itself and the tumor removal takes time but the escalation NATO started will end after their proxy and themselves are eliminated (or as Arabs call it ازاله) from the region.