Anyone Google hires in the UK (up 'til now anyway) has been educated at the expense of the taxpayer, for example. If someone breaks into their offce, the police will show up to investigate. Why shouldn't they pay their fair share?
Fortunately we have a government now that ain't gonna stand for no jibba jabba.
Besides, if you look at the things the government is doing with the money recently vs. what Google is, there is no contest!
Google is not obligated in any way shape or form to pay more for taxes if there are rules and regulations that state they can operate their business in a certain way that allows them to not be taxed for that amount of money.
As a socialist I don't agree with that (I am from Europe), and I wish they did pay more taxes as it would certainly help the various governments there provide social services, at the same time I can definitely see that Google who is accountable to its shareholders and has to make as much money as possible is going to use the loopholes to keep as much money and not have it taxed.