There's plenty of evidence I and some others here have already alluded to a number of historical examples showing what was happening in the United States and Europe before these measures were introduced. Aside from that, there's an abundance of evidence that crime is related to socio-economic conditions, i.e. poor people are more likely to promote crime, so much so that it seems trivial to dig out an actual article but if you want me to look I will. What other kinds of evidence are you looking for?
During previous recessions and depressions, the unemployment rate and the mean duration of unemployment were both lower than they are today. The major difference between then and now is the extensive unemployment benefits people have access to today. That strongly suggests, at least to me, that reducing unemployment benefits will lead to people finding work.
I would like to read about our almost communist revolution in America. I'm guessing it's same bullshit about the brilliance of unions and the success of social welfare I was spoon fed in college, but If I can see what you're talking about I'll provide a better answer.
Again, I'm curious to see what you actually think will happen when people have these kinds of programs taken away from them? Do you honestly think people with no jobs and no employment benefits are just going to fall in line under what libertarian values say they should do?
As I said, if we reform the welfare system gradually I think the effect on the economy will be positive. Not only will unemployment likely go down, but we won't be diverting as many resources from productive channels to subsidize people who aren't doing anything. That can only improve the economic situation. I wouldn't expect mass rioting and revolt in that scenario.