Presidential election in the United States of America - should I care?

I have no idea what all the issues are, concerning the people living in a country located thousands of miles away which is locked between two oceans the Atlantic and the Pacific. However when one sees the candidates speak about things, which can be very surprising.
For instance no public figure leave alone politicians would over dare, openly discuss whether gay marriages should be allowed or not, Because if anyone were to admit being gay , because of existing laws he would be confessing to a crime and will end up being thrown in jail; so the question of allowing gay marriages can never arise.
With respect to the prevalence AIDS - no one knows how many people do suffer from this disease here and how many so far have died because of it, so far. The official policy is absolute denial and camouflage. Taking advantage of the ignorance of the people, doctors can attribute the cause of a patient's death to any number of diseases and no one would be any wiser. A doctor could know that a patient has AIDS, but will not admit that he does. The fear is that to give figures about the details how many people are suffering from AIDS and how many have died from it, would begin to give the world 'the wrong message' that Pakistanis are not as prudish as they are made out to be and not fanatically 'Islamic' as they it claimed to be. Such information would also require to allocate funds on AIDS prevention and cure But due to official denial. money is available other more seemingly more important things.
The only concern about the outcome of this election is that how many more countries will be attacked and conquered. Since the United States of America is a democracy and not a dictatorship i.e. has an elected representative as president, his actions are directly the result of the people who voted and entrusted him. The people cannot have it both ways - saying that their leader misled them and forced them to start wars and at the same time claim to be a democratic.
Only dictators can afford to mislead the people and get away with it, They can send their soldiers to fight wars on false pretexts, because it serves the dictator's personal interests, it does not benefit anyone else except him and the members of his family, the greater national interest is the least of his concerns. But elected individuals are constantly being observed and always held accountable for their actions and can be challenged at any time. Their actions are directly in response to what the people expect from them decisions are respected and supported. So whatever action a public representatives takes if in long term eventually does more harm than good - then an elected person behaves irresponsibly it reflects on the kind of people who elected him.
As regards domestic issues the people of United States of America have - no one over here can even begin to understand, because those are issues which no one can identify with.
Finally the most commonly asked question here and nearly every other county of the world, is how is it that the United States of America, has only two candidates - contesting for the post president, why not ten or twenty, with just as many political parties backing them?