> writing off bad behavior as "normal imperfect human behavior" is just an excuse to break rules
Which rules? There are no rules saying "you can't do marketing" or "you can't claim to change the world".
> Are you implying that the hyperbolic marketing of startups is a feature and not a bug?
I am implying it's a natural consequence of a startup being oriented on doing something new, never done before, and natural consequence of somebody being about to undertake a high-risk/high-reward activity. That requires certain mindset. Wanting to change the world highly correlates with such a mindset. Wanting to improve the cost of fidgelating type A sprockets by 0.1% does not. Of course, if humans were perfect robots, they'd always be exactly as much excited as it takes to be able to do a startup, and not one exciton over that. Imperfect humans frequently get more excited than that.
> there's a cognitive dissonance when 500 startup founders believe they are all changing the world
There's million of traders believing they can make a profit (which is arithmetically impossible) and millions of people believing they all can win a lottery (which is even more impossible since lottery is a negative-sum game). Of course, vast majority of these people are wrong. And 499 of the 500 startup founders will be wrong too. So what? Why is it "toxic"? What's your problem with them believing it? People hold much more dangerous and useless false beliefs every day than belief that you can have positive impact on the world.
> But there are SV companies which provide ample evidence that marketing is all the do. Juicero, Yo, etc.
Didn't I just admit there are some companies that are just hype in the very next phrase, and explained why this admission does not disprove my point?
> This is a very unique aspect of tech culture, and not at all a good one in my opinion.
High risk investment is in no way unique to SV. There are lots of people that invest in all kinds of crazy stuff, from hipster juicers to high-stake poker games. They can afford it, and they are the lifeblood of innovation and invention. All power to them. I literally can't think of anything bad coming from a billionaire spending some promilles of his outsized bank account on some weird innovative project, that may or may not change the world. Some of those would be stupid, so what. You can't make innovation without doing a couple of stupid tries on the way.