Liberals would opt out
In the UK income taxes are more than double for the middle class than they are in the USA. British people often say you should be ok with paying double the tax so your money will go to healthcare and college for others even if you are not in need of those programs yourself. It is your civic duty so to speak. But I believe if you gave them an option to opt out and not pay for other people's benefits they would do it in a heart beat. I think 90% of them would much prefer to pay the 18% USA tax than the 41% UK tax even if it meant their money would not go to other people's social programs. If the government gave them a choice to pay for the programs or not pay for them most would choose not too.
I say this because I have noticed a trend with many of these people. Ive seen them walk right past homeless people, without giving them a dollar and then and simultaneously complain that the government should help them. There seems to be a disconnect and they dont realize the government will just take their money and give to the homeless. So they can cut out the middle man and donate themselves, but they don't. Often times these people are terrible tippers too. They will say "their employers needs to pay them more" but when its time for them to pay a waiter who is vitually their employee for the meal they dont (even though they are in charge of the wage they do not pay well. But will say the CEOs of other companies are greedy for not paying enough). They would rather pass the responsibility to someone else.