Here's an exaggeration to make a point:
“The housing bubble didn’t really hurt anyone who already owned their home, or those who never owned a home in the first place.”
Yes, a tech/start up bubble burst would not have near as much impact as the housing bubble for the reasons you point out, but when you suggest that it won’t hurt “anyone here” (i.e. people who frequent HN), I’m not sure I agree.
Let’s say Angel and VC money dries up, and Series A funding also dries up. You then have a bunch of start ups that don’t get funded at all, or who burn through their first Angel/VC raise, and then can’t get any further funding. They then can’t afford to hire or keep talent (hackers, system admins, designers, etc. – i.e. the people here) and there are only so many positions at companies like Apple, Google, Facebook, etc.
So, depending on the percentage of people who depend on work from start up, or early stage companies who are not yet profitable and need to rely on further funding to grow, a “bubble burst” could impact people on HN.