From what I can gather, these are the 4 main reasons.
- We have stability and you don't. It's been 26 years and there's no hope for the South. It's time to go our separate ways. Greater Somalia is dead.
- We cannot forgive the Isaaq genocide, the SNM didn't fight for nothing. They liberated us from tyranny.
- Even if we were to reunite, some tribes will always be looking to dominate all the other tribes. They can't let go of tribalism.
- The South has refused to reconcile with us, and allow tribalist war criminals to roam free.
In summary, they are afraid of history repeating itself. Old wounds haven't healed and Xamar shows no remorse.
In my opinion, the first reason is bs. Their military could wipe out all the insurgents, but they are unwilling to help(albeit they have a good reason not to). To think that our worst enemy is "helping" should be humiliation enough, but they don't see it as a Somali embarrassment, it's more of a Southern problem to them. The separatist mindset doesn't allow for that collective type of thinking. They've forged a new identity for themselves.
The second reason is somewhat valid, but the SNM was wrong. All sides were wrong.
The 3rd reason is paranoia plain and simple. That type of thinking keeps us in the past. If one tribe dominates, that would mean all the other tribes are with you on the same boat, but you're selfishly concerned with yourself. And that means you're serving your own interests. If you want to oppose the dominating tribe, then keep the national interests at heart and not your own.
The final reason is credible. If Xamar keeps up this petty bullshit and all these criminals die free men, then I can't really blame the separatists for wanting independence. The only hope of reunification we'd have after that would be in the distant future with a (hopefully) smarter generation. Waaq willing, they'll be able to shatter the lens of tribalism, that is, if we haven't dissipated by then.