<p>This is a question I've thought about for some time.</p>
<p>the reasons:
=> people are dispositionally different, all inclined differently to do certain things</p>
<p>for example, there are a a few Ayn Rand fans. Now, I'd actually be scared if everyone in the world embraced Ayn Rand. But perhaps the few people who do embrace her philosophy are also dispositionally the most suitable people for her philosophy. And perhaps they are better off due to it - they feel more creative, less constrained, etc. While i don't necessarily agree with her on anything, I usually am rationally selfish (e.g. I'm not altruistic unless I know that the other person has some chance of recognizing me, I don't donate to charity, I don't participate in any "help the world" activities). I realize that my actions are of limited impact and that they are unlikely to impact the actions of others, so I just go by my self-interest (i'm actually slightly more inclined to altruism towards areas where people have little altruism towards though). One could argue that too many people could go that way (but there are roots to altruism in human nature, and some are naturally more so than others, and I doubt that too many people would find Rand appealing). </p>
<p>Similarly with altruism. Some people are naturally more altruistic towards strangers than others. It's probably good for the world that there are a number of altruists. </p>
<p>But anyways, it may be good if people of varying dispositions don't all embrace the same moral standards (although there probably is a core set of standards that almost everyone follows - a limited set of standards, such as "don't hurt someone else unless you have a compelling reason to and unless you have no other recourse).</p>