Of course, we cannot objectively say that it is important for people to be aware of homelessness. This is a subjective claim about how things should be. If we assume that it is important for people to be aware of homelessness, we can say that there are at least two reasons why it is.
First, it is important to be aware of homelessness because homelessness if a form of social injustice. It is not right, one can argue, for people in one of the richest countries in the world to be without homes in which to live. Justice is important and therefore awareness of homelessness is important.
Second, it is important to be aware of homelessness so that we can combat it. If homelessness is unjust, we should want to eradicate it. We cannot eradicate it unless more people are aware of it and want something done about it.
Thus, we can say that we should be aware of homelessness because it is a form of injustice that we should want to fight.