It is unfair that in some states gays cannot marry yet. They are just the same as everyone else, they just love the same gender. Who they love doesn't affect anyone else and they cannot choose who they fall in love with as they were born that way. They can't change even if they wanted to so they should be able to get married.
Of course gay people should be allowed to marry. What gives you the right to deny anyone of marrying the person they love and being together for the rest of their lives? This is unfair. What we need is decency and equal treatment under the law. Anybody who disagrees is on the wrong side of history.