SubxannaAllah, this is something I often think about. We hear about young men losing their lives in clan conflicts, yet they never mobilize to liberate their country. Why do they choose to perish in senseless struggles instead of dedicating their energy to a greater purpose!!
Narcism of small difference.
Because those other Somali male's from the neighbouring clan's have a direct effect on his livelihood, hence majority of the energy is directed there.
Let me give you a religious analogy to drive the point home further, using Salafi and Sufi groups. The greatest beef is within Salafi circles itself, the same applies to the Sufi's, you may wonder why but its easy.
Imagine your a Salafi preacher with a mosque, your income comes from the Salafi communities your preach to through donations to the Mosque as well as Dugsi fees and other courses you sell.
Who is your greatest threat with regards to $$$ status and influence? It won't be the Sufi preacher across the road because you have different audiences, but the other Salafi preacher has the same audience as you, he is able to entice away your followers and thus reduce your influence and $$$ by a significant margin.
To protect this, all of your energy is focused against him because he presents the greatest immediate threat to your livelihood, whereas the Sufi preacher threat is long-term.
Hence the intense internal bickering and hatred, you will mostly ignore other idealogical groups you have major differences with to focus on the immediate danger to your livelihood, survival instinct kicks and Shaytan amplifies this further by promising you poverty through inaction.
This concept applies everywhere in life including the clan example, keep in mind much of the clan conflicts are actually internal, people will always focus on their immediate dangers the most which in the majority of cases is always someone of the same clan or idealogical persuasion unless there is a real perceived immediate greater threat.