There is a very thin line between a having strong opinion and being obstinate. An opinion is a terrible waste if it doesn't possess flexibility, the ability to change when a better ideology comes into picture. We all possess this inflexibility with varying degree. "All South Indian curries taste like sambhar". "All men are rapists". "Girls can't drive". You and I keep coming across such obstinate opinions. Some people expect things, people, in fact the entire universe to behave in a particular manner. When those don't, they call those people, lunatics and those things, hazardous.