If you have money invested in a stock or mutual fund, your brokerage/bank can't use that money to maintain its liquidity. It is a security that you own.
However, if you have it sitting in cash in a bank or a brokerage account, the institution can now take 100% of that money (because reserve requirements have been eliminated) and use it for its own ends to keep itself afloat. A bank deposit is no more than an unsecured loan from the depositor to the bank.
Accordingly, a Dow scare that causes investors to pull their money out of stocks and into their cash accounts will help the liquidity problems of the banks and brokerages. A drop of 1000 points in the Dow could be equivalent to a multi-trillion dollar bailout package for Wall Street.
So if Cramer and the talking heads on CNBC stop calling a bottom and begin encouraging investors to sell, there may be deeper motives.