1. Did you not read? Fund the IRS properly and the government could reduce taxes and keep the same level of revenue. Why isn't this happening?
2. The US is not highly taxed in comparison to other western democracies. Wealthy individuals and companies could pay more tax and barely notice it.
3. The US military doesn't need to be funded to the level that it is today. Explain why it should not be cut.
So, yes, if it takes more tax to have a society that protects more than just the wealthy, taxes could be increased.
You cannot read that graph. It doesn't say what you think it says, and, even though my family income is probably in the top 10%, we don't pay 20-25% of our gross income in federal income taxes.
The big, big issue that needs to be dealt with is: why does healthcare cost so much in the USA? Care to explain that one? If you want to claim it is better than in other countries, back that up with statistics on life expectancy, medical outcomes, etc..