Crashing the stock market doesn't destroy capital. The market crashing means that the sale price of shares are reduced temporarily. Shares are still a proportion of ownership in a company. The rich will still own the overwhelming majority of all shares no matter the share price. The reduced prices also allows the rich to buy up shares from ordinary people who had to sell to afford necessities. Capitalists use economic crashes to further entrench themselves.
Even if companies fail and collapse, any valuable assets will be taken by other companies. A crash doesn't destroy capital, it just reorganizes it.
The US has gone through much bigger crashes than this, and none of them dismantled capitalism, and neither will this.
If you want to dismantle capitalism you have to actually put in the work of dismantling capitalism.