I dont think the BBC particularly has to lie.
The British have said they've no interest in the conflict now.
Why would the BBC need to have a propaganda campaign to the dumb British ignorants who havent a clue.
They don't have to fuel the conflict, assad has done a good job of that by murdering innocent people.
And the sunnis wont stop until he is dead. That is a fact. And he knows it. That is why he drops chlorine on sunni towns.