> For lots of people, they're not happy, the system doesn't work for them and they have no redress.

There are always people who are unhappy. There is no system which will make everyone happy all of the time.

However, if you give the keys to the populace at large with unlimited power, you'll have tyranny of the majority and then you'll have bigger problems to chew on.

Do I really need to cite the most recent election as evidence? Democracy will always lean towards populism. Its only use is as a check on government.