Why is there a feeling that "it will end badly"?

Many commentators, economists and investors have the sometimes vague feeling that "it will end badly". Why? There are obviously geopolitical risks (Middle East, South China Sea, Ukraine, etc.), but in this Flash we will focus on economic and financial issues ; The first risk is that of a debt crisis, which will definitely break out if inflation and interest rates surge again; The second risk is that of financial instability, given the excessive global liquidity and the risk of bubbles; The third risk is that of a social crisis in OECD countries due to the skewing of income distribution at the expense of employees and the polarisation of jobs. It is actually a social crisis, by bringing back inflation, that could trigger a debt crisis and a financial instability crisis .