"Rural bias" is a feature, not a bug. In allocating power in Congress and the Electoral College, the Founders wanted to give weight to geographic region as well as population. Obviously this benefits lower populated states. America was founded as a union of states, and a republic, and was not designed as a direct democracy. Rule of the urban majority mob would be a lot worse than the current structure.
Is it true that they wanted to give weight to geographic regions?
I'm curious because the way I heard the story it went something like, "they needed the House to get the big states to agree to the Constitution, and they needed the Senate to get the small states to agree". That also has the effect you're talking about, but I never heard that it was deliberate. I would be interested in why they set it up that way.
"In this spirit it may be remarked, that the equal vote allowed to each State is at once a constitutional recognition of the portion of sovereignty remaining in the individual States, and an instrument for preserving that residuary sovereignty. So far the equality ought to be no less acceptable to the large than to the small States; since they are not less solicitous to guard, by every possible expedient, against an improper consolidation of the States into one simple republic.
Another advantage accruing from this ingredient in the constitution of the Senate is, the additional impediment it must prove against improper acts of legislation. No law or resolution can now be passed without the concurrence, first, of a majority of the people, and then, of a majority of the States. It must be acknowledged that this complicated check on legislation may in some instances be injurious as well as beneficial; and that the peculiar defense which it involves in favor of the smaller States, would be more rational, if any interests common to them, and distinct from those of the other States, would otherwise be exposed to peculiar danger."
Yeah this is pretty much it. The senate is there to help preserve the state's rights equally. Without it the larger states get an unobstructed bigger say over the smaller ones. Remember the federal government was setup to be very limited keeping most of the power in the hands of the states.
I don't see why people out in the country are any less likely to be part of a mob, or why their vote should be worth something around 10 times what an "urban" person's vote is.
"Rule of the urban majority mob would be a lot worse than the current structure."
That's pretty clearly only your opinion and not an obvious fact. Urban centres tend to vote for more progressive policies in the US, so all you're saying is that would be too progressive for your liking.
But who says one region matters proportionally more just because it's bigger? Isn't society all about the people, so isn't it the people that matter? Are you really saying that it's not about being a person, it's about how much land you have?
Besides, what this imbalance really does is allow national groups to game the system. By focusing lobbying/campaigning efforts in smaller states, you can gain influence in government more efficiently than by trying to influence the high population regions. Which distorts the importance of those small states even more...