Justify

We have a habit to justify everything. Be it related to us or not is a different question. But justification is a quality we pick up very early in our life. As soon as we start talking, and become capable of making mistakes, we start to justify.
It is a habit. We justify our actions, our words, our looks to everyone around us. Be it our parents, our neighbors, friends, or even the unknown person who may be sitting besides us in a public transport. And if we are not with a company, we justify to ourselves!
It may be a good thing to justify. But I feel that it takes the fun out of everything we relish. I mean, why do we have to justify if we have one more bar of chocolate if we like it, or take a drive at 3 am if we like quiet roads, or for that matter, just speak what we think is right? We have to justify, or rather we are in a habit of doing so, for every single thing we do.
Odd it seems, that those who do not justify things are branded anti socials. Why is it always necessary for us to make others understand our point of view, or our line of thought? Why can we not just live our lives like we like to live? Instead we just do those things which we can justify convincingly. Why is it so?
I will not answer that. Because then, I will be justifying our social norms!