Adding Injury to Insult

The first argument for ethical egoism states that looking out for others' interests is self defeating. The argument may be stated in different ways but it boils down to the following three ways of thinking.

We all know what our own interests are, better than anyone else does. By looking out for others' interests we may be doing more bad than good, because we don't know exactly what they want. Another way of thinking is that by looking out for others' interests we are intruding on their privacy. And finally, by offering help (looking out for others' interests) you are essentially stating that they cannot do the job themselves. Hence, it may be interpreted as an insult, because it robs them of the ability to help themselves.