Well, I think that ABSOLUTELY EVERYONE agrees that our taxes are spent on the wrong things. The young think too much is spent on the elderly, the healthy think too much is spent on the sick, the pedestrians think too much is spent on roads, the childless think too much is spent on education, etc... And I bet there are people who think that homeland security, the police and the military are getting way too much.
But until someone comes with a better way to decide where the money gets spent we are stuck with the time honored one: wherever it will bring the politicians more power, which in the US means votes and campaign contributions.
And a lot of noise will be made as to where expenses will be cut... usually, whatever programs do not have powerful, organized groups benefiting from them. You can't cut grandpa's check without losing his vote, but you can cut school lunches or fail to fund infrastructure maintenance.
There are no easy solutions. And speaking for myself, I can a lot more benefit, for myself, by working harder, than trying to influence how much I pay in taxes, and where it gets spent.
I have a choice where I live and work. I chose the US in the 90s, and I do not regret that choice, not even when I have to deal with our healthcare (which is the only thing I think is done better elsewhere). Pre- or post- Obamacare, with my experience of other healthcare systems, the changes are not worth commenting on. It was terrible, it is terrible, but as long as I have a good income, it's survivable.