Shorting a bubble moderates its price rise.
Speculators are part of the market, not observers, and they absolutely contribute to rising prices, not just price discovery, because they add demand.
Speculators buy and sell, in equal measure. That's what makes them speculators. It's a net zero.
If they bought and held, they'd be investors.
They also hold what are limited resources for a non-zero amount of time, reducing supply in aggregate. More speculators, more supply constraint.
This is not some sort of idealised marketplace where people can dip in and out without any effect.
> This is not some sort of idealised marketplace where people can dip in and out without any effect.
You're right. Speculators work to decrease the peak of a bubble and increase the value of a dip.
The misapprehension is thinking the effect is only one way.
In the housing market? LOL.
> Speculators work to decrease the peak of a bubble and increase the value of a dip.
Except that's nonsense, they increase the demand on an already massively in-demand resource, accelerating price rises.
Your ideas fly in the face of observable reality.