Why are people talking about a crash?

[Sam Josh]

I see several posts where folks are :

1) Trying to predict the crash using causality of metrics like lower unemployment and low interest rates

2) Trying to preserve cash for the next crash, so they can buy

I want to hone in on #2. What makes people feel there will be a CRASH? To my knowledge the first crash was in the 1930's and the next one was not until 2007. Why do people think there will be another one soon and now. I can completely understand a discussion about a slowdown or a dip but a crash?

Also how prudent is it for people to 'save funds' for a cash, so they can buy more properties!!. Is'nt a crash just a disaster where a lot of things go down including your own employment, savings, higher and rising vacancy rates, rapidly falling rents. How does saving cash now make sense to buy in a crash?