Hello Nikhil S. Gurjar,
You raised an interesting query.
Like Dr Ulhas Ganu mentioned, Strong views come with knowledge--sometimes, sadly, with half-baked knowledge too.
Ego is absolutely different from 'strong views', yet linked to each other. Ego, to the extent I understand, has more to do with 'how one expresses' the strong views--NOT the content of what is being expressed/conveyed per se.
Let's assume I know a lot about a particular topic. I can share the info like I tell a movie story--plainly & simply; OR I can gloat to one & all that I know this stuff--directly or indirectly pointing out that not many people know what I know; OR focusing MORE ON WHAT THE OTHERS DON'T KNOW than what I know [akin to what Dr Ulhas Ganu mentions about STICKING to ones WRONG DECISIONS].
To the extent I understand human psychology, the III attitudinal response is a natural progression of the II type of response--something that develops even without the particular individual even realising it, simply because no one attempted to point out the flaw earlier. And so he/she begins to assume that THAT attitude is the right way--and hell breaks loose if, after that stage, someone tries to point it out.
Rgds,
TS