I often get on peoples' nerves by asking 'why?', until they realize something I've seen coming two hours earlier not because I'm a genius, but simply because I'm used to thinking ahead and exploring the possibilities. I've been doing that long enough (was raised that way) so that it happens automatically and very, very quickly.
I don't mean to be harsh, but this is the only way I can describe it: I think it's because they actually don't have well thought out reasons for lots of the things they do, and they don't want that exposed because it could weaken their already shaky worldview because then they'd be standing on shifting sand, not a stable bedrock of unquestioned ideas.
So they just continue accumulating possessions like the happy people in the movies do, ignoring the mounting evidence that these things haven't made them happy in the past, but just one more possession, maybe that'll be the one before I happily drive off into the sunset with the end credits rolling.
Maybe I'm rambling, but I struggle to understand why some people keep doing the same things and expecting a different outcome, and asking them "why?" rarely seems to elicit a well thought out answer. The answer in the end just seems to come down to, "because that's what I do".
Some people are not introspective. As an introspective person myself, I always attempt to understand why I do what I do, admittedly that can be draining at times and doesn't always come up with meaningful answers, but I'd personally prefer to at least attempt than to wander around in wilful ignorance.
Being introspective is intellectually challenging and rewarding but can also lead to a lot of frustration and dilemmas. That makes a lot of people uncomfortable. It is required though.
Why not be happy right now? The right way to go about it is that you tell yourself "I am pursuing my goal and I am happy, right now, to do so." It is incredible how this changes the quality of life, plus you can detect problems with yourself and the environment early because if you can't be happy with your present situation at all, it's time to change something.