I understand your stance. However, a major principle of Ibadi is that a community has the right to determine its own leaders, hence their own laws.
Wheras in Sunni and Shia, leaders of any given community has to be a descendant of the Prophet (blessings be upon him).
Also, For many Muslims, Islam cannot be divorced from culture nor politics. This poses a special problem as it would take time to develop any degree of successful secularism as we see in say, a nation like Turkey.
The issue with democracy is the average voter!
Terrorist are actually doing a huge favour for secularist Muslims. Most Muslims are moderates, the more they see of Muslim terrorist killing other Muslims and causing havoc in Muslims countries, the more they will think shariah law is not so great after all.
Reformation in the Christian world was long, difficult and bloody. The same is already happening in the Muslim world.
Muslims go crazy when there is talk of reforming Islam, but the truth is if you look at the history if Islam, it has gone through reform from the very beginning. The prophet himself said Allah over ruled previous rules, thaf were laid down to the sahabas.
So reform is already happening, the likes of ISIS and Al Shabaab are just bringing the "bloody" aspect of the reform part.