Fortunately, you are completely wrong.

The thing you fail to take into account is that we are all one.
And thus, at one level, we are looking out for number one, all of us.

The biggest problem in seeing altruism as reality is that our current govern-cement / monetary systems are designed to keep everyone as poor as possible. To keep them in physical need, so that they can't grow up the Maslow's Hierarchy.

But, if you study self-made men, you will find that after they get financially set for themselves, then they all turn towards helping others.
(don't confuse these people for those who steal other people's money to get rich, like politicians, banksters, investment brokers...)