As far as rationals not believing in absolutes, look up Objectivism.
Using the example stealing from a friend is worse than stealing from a faceless corporation due to the interpersonal nature of the first I disagree.
While stealing from a friend can impact you quicker than stealing from a corporation it is no less hazardous.
When somebody steals something then the rest of society has to pay for it through higher prices on the goods themselves to recoup the loss. If you think that a corporation doesn't pass the loss on to the consumer you are deluded. As far as the product not costing much, it doesn't matter a loss is a loss in a corporation's eyes and if enough people do it, then it will affect everyone.
So yes I am a rational and I do believe in absolutes, anything that negatively impacts me is evil and anything that positively does is good, end of story.