If looking out for oneself is normal human behavior, can we really fault people for doing so?

Are we referring to self preservation or self promotion? I place the former over the latter.

There's a difference between looking out for yourself and looking out for only yourself. 

If it is at the direct expense of others for material gain, yes we can. 

The Truth Is That You Must First Love Yourself Before You Can Love Another - Ricardo Martinez

Easily---at least in a civilized society.

A soldier has no rights, but avoiding capture and escaping from prison are considered duties. A citizen supposedly has rights, but resisting arrest and escaping from prison are considered crimes.

Of course not - that is natural.  Survival.  But when that is only as far as they go then they are selfish because they have not cultivated a social dimension.  In looking out for ourselves we can hurt others if we are not careful.  And sometimes even when we are. 

i dont think so