Like you've said before Farmaajo is a dictator and is president by force. (Not that its true)
But If that was really the case he would've been evicted a long time ago. He has more Hawiye support than perhaps any other qabil. Hes president because of Hawiye. Hes going absolutely nowhere thanks to hawiye and the only people who can forcefully evict him from Villa somalia are again...hawiye.
If the people didnt want him the troops would've been the very first to start a rebellion. Keep in mind Siad Barre remained in office up until reer Mogadishu had enough. The ordinary citizen supports the government and the moment he loses their support he wont last a second.
And that's only because Xamar is hawiye capital. They run every block