They don't suck at shrinking. Shrinking isn't sustainable in capitalism because of how the system works.
The finance sector, a key component of capitalism, is built on money being lent with interest rates, so the debtor has to always pay back the original amount of money + interest, and that interest can only come from the debtor growing their money with the loan they invested into something.
As such a permanent economic contraction doesn't exist in capitalism as any contraction will quickly lead to banks dying which will in turn cause a collapse of the whole economy because companies need loans.
That is also the reason why #ClimateCrisis will ultimately lead to the demise of #capitalism, even if mankind doesn't remove that tumor of a system on its own accord. At some point #ClimateCrisis will become so dominating that trade or even regular economic activity won't be sustainable anymore.
breadandcircuses