The west does not want to get rid of al shabaab, they want to continue the occupation. They need to leave and make way for the capable Turks to assist the SNA get rid of them.If HG, the most militarily capable Hawiye subclan, are struggling with Alshabab on flat terrain in Mudug and Galgaduud, what chance do D&M, Abgaal, Xawaadle stand in front of Alshabab?
The minute Amisom leave Alshabab will already be shelling Villa Somalia with mortars. The SNA these people expect to fight after Amisom will all retreat down the highways from Bay, Hiiraan and Lower Shabelle into Mogadishu and try to secure a perimeter for a month or two before they begin to surrender en masse.
Hawiye will go from this:
to this:
faster than you can blink.
They are not trying to get rid of them they are keeping them going.