Would we need Social Security if we properly regulated Wall Street?

[Maid Mesmera]

The purpose behind SS is to provide a safety net for the elderly in case they lost their savings in a stock market crash, right? But, stock market crashes can be prevented if Wall Street is properly regulated. In fact, that's how stock market crashes *have been* prevented in the past. If stock markets didn't crash and people didn't lose their savings, we wouldn't need SS and would then be in a good position to get rid of it, right?
How would I know: I'm not a liberal. No liberal would ever call for the abolition of Social Security, like I do.
If regulations can't prevent stock market crashes, then explain to me why, after we enacted Glass Steagall and other regulations, we didn't have a stock market crash from the 1930's to 1987.