Seems like, with only a few exceptions, it's impossible to have a good argument lately. Whenever a discussion gets to the point of really becoming interesting, suddenly people start to appear with messages like "why do you really care about this, it's clear you're not going to agree..." or "is this really worth fighting about?"

That's not the point. An argument, a constructive discussion, isn't about making the other person agree (although th always sweet when it happens), and it isn't about causing a fight. It's about trying to further your own understanding of a subject through dialectic.

Dialectic (n.) "the art or practice of logical discussion as employed in investigating the truth of a theory or opinion." (dictionary.com)

Dialectic sharpens your mind. What it does is pit your idea, as finely honed as you can make it on your own, agains the ideas of someone else, who's also made them as strong as possible. Like fencing, the idea is to get holes poked in your theory so that you can retreat, learn how to better guard them, and advance again. Argumentation isn't about hostility or even about winning. It's about learning. Other people think differently than you do. No matter how brilliant you are (or think you are) it's a good likelihood that your reasoning on any given subject is flawed if approached from the right angle. How are you to know which angle that is, unless you lay out your ideas for someone else to try on for size? It's hard to criticise yourself because you lack objectivity. Other people provide that vital sounding board, so you can see when you're being misled, or pompous, or just plain silly.

It doesn't matter that nobody's right or wrong. Having a concrete answer isn't everything. That's not the point of a good argument. Let's just see what you think, and you can see what I think, and together maybe we can learn from each other.