Is it rational for a leader to gas its citizens,I think Saddam based on that fits into the irrational category above,but there is our difference in opinion.

Wicked, yes, but not irrational, unless being wicked is irrational. These were citizens who didn't want to be citizens, Kurds who had welcomed the Iranians as liberators (which they were). It's not at all rare to find governments all over the world who aren't toobeen too worried about killing their own citizens when they are seen as "the enemy within". When the French murdered tens of thousands of Algerians, they were killing their own fellow-citizens. And when
the British murdered tens of thousands of Kenyans, they were killing fellow-subjects of the Queen.