Aristotle formulated a rule of thought known today as the "law of non-contradiction". This law is considered to be the fundamental principle of reasoning. It essentially states that a proposition cannot be both affirmed and denied simultaneously. This would render the argument invalid. In other words, it would make nonsense of the whole process of rational thinking.
I notice that there are too many glaring examples of contradiction in our society today. Just take a look at the news in any newspaper - mainstream or otherwise - and try to spot these contradictions. All these self-contradiction made by various quarters made me come to one conclusion.
We do not seem to have the ability to think rationally, what more act rationally. Looking at this from another angle, it simply means we are a nonsensical lot.