The Greeks have been 'enduring' cuts for a long time now, many normal, middle-class citizens have lost their jobs, homes and livelihoods because of the cuts. Sacrifices can only be endured for so long. The riots and protests, that have been ongoing since early 2010, are against further cuts that will drag the population to it's knees. If the country has massive unemployment, which it is bound to with further austerity measures, how can the country be expected to pay off debts if their economy goes down the drain.
Greece will become bankrupt and 'suffer the consequences' sooner or later. That is inevitable. The only difference between bailing it out now or leaving it to fate, is that Greece will be forced to pay back the mostly German and French banks. In effect the 'Greek bailout' is little more than a German and French bank bailout.