Ugh. I really didn't want to get involved in this debate, but goddamn that post was so stupid it needs to be smacked.
"If the peoples' taxes pay for a single family's upkeep, millions of dollars are being wasted monthly that could be used for more important issues, like education, defense, or internal improvements. "
First point: Millions of dollars are not being wasted. All of the money spent on the queen would be spent even if there was a president. Why? Because the Queen gets money for a variety of reasons. She is the head of state. She does not sit on her ass all day and eat finger sandwiches. She's flying to different nations representing Britain, acting as a head of state would, engaging in improving diplomactic relations and speaking on behalf of the Prime Minister. This would not change if there was a President. The manner in which things happened may, but the money would still all need to be spent.
Why? Because the money given to the Queen isn't given to her just so she can have money. It's not just a salary. It's monies given to maintain Crown estates (like Buckingham Palace) which would require maintanence and staff even without a queen and to offset the money spend in performing her duties as Queen such as performing diplomatic missions to other nations.
"The very existence of a hierarchical monarchy leads to increased deference and reduced social mobility."
Allow me to introduce you to
Tony Blair the son of an illegitimate boy of two actors who was raised by a shipyard worker.
Opposite to him, allow me to introduce
George Bush, heir to the Bush political dynasty, fourth cousin (four times removed) to James Garfield and (ten times removed) to George Washington.
And that's not even the beginning lol. It's just that the political dynastic ties in the United States aren't flaunted through title and pomp.
Now allow me to dispel a little illusion America loves. Just because you have or do not have a monarchy or aristocracy has absolutely no influence upon whether or not there is social mobility within your nation. The upper class are going to be an exclusive, extremely xenophobic group whether you call them Mr. Walton or Sir Marlborough. The poor are always going to get the short end of the stick and if, by some God-given chance they should rise above the circumstances, defy the odds and make more than an average income for themselves, they will be in a strong minority of people. Right now the conditions of wealth within America are at an all-time low with regards to the distribution of wealth with the people who are rich maintaining ludicris control over the amount of money in the nation. And the divide between them is still widening ever faster. This is a completely separate issue which is utterly naive to believe is tied up to whether or not someone has title to their name and an ancient castle somewhere.
"On the flipside, many members of the royalty could find it completely fine to do nothing that helps society." This is an assumption without any basis.
"While of course very many aristocrats are or have been great philanthropists, the vast, vast majority of noblepersons throughout human history have done little more than live off of the people and give nothing back." I am not going to bloody beat into your head how much pilanthropy the Royal family does.
"Although Dovahkiin pointed out that House of Windsor earns a profit for the United Kingdom through the lease of land owned by the family, that's a very indirect effect of monarchy. " No, this is not indirect. It is direct, which means proceeding in a direct line. Why? Because the Crown Estate is a statutory corporation which generates revenue for the Treasury every year. Indirect revenue would be the money made via tourism because you can't actually trace where it goes or how it's directly spent, but it all goes into the economy and then is taxed later.
"If not for the aristocratic system, the family would likely not own the land." I don't even know what the hell this is supposed to mean. "If not for the capitalist system, businessmen would likely not own the land." It's such a general statement without any actual substance to it.
I'm not even going to address the last paragraph because it is uneducated and so lacking in anything of value it would be a waste of my time.