When arguing, why does one have to completely die in order to prove the other one is better ?

The usual flame war on the internet goes like this :

C# is so good that soon perl will die.

or

JavaScript is so much better than anything else that soon we will all be programming in javascript.

This stuff makes me crazy. Especially when I think about that most of the kids that make these comments are well just kids. They learnt javascript and have probably done some real cool stuff with it and one always makes assumptions based on one experience, so for that kid to say something like that is fully understandable and in a few years that same kid will be saying something new.

I hate flamewars, I truly do. I used to think they were funny, I spent hours arguing why PC was better than Mac and why Turbo Pascal was so much better than C many many years ago. I usually did not know why it was better, it was just better because I was good at it and not the other thing.

I just wish that there not the usual repeaters in flamewars, then I mean less people saying the exact same thing as all the other persons.