Why we always say Sorry & Thank you?

Saying thank you is very easy but saying i am sorry is not easy because most times you don't know why should say that

If I've made someone upset or mad, thats why I ask whats wrong? if they say me, I say why and they'd tell me why, then Id say sorry and make it up for them, thank you is just polite and it shows you appreciated what you've done for them.

I don't find it easy to say sorry and I only do so if really feel sorry and I mean it. I don't like people who say sorry each time, it's just too easy and in many cases also a way to make you shut up (I said sorry so now you are not angry/upset/sad anymore and it is over). If you hurt someone that person has the right to feel hurt and it takes time to think over these feelings and also time to get over it. Saying thanks is a good thing and also a way to show you are happy/appreciate with/what someone else did for you, you don't take that person for granted and you still see the care someone shows for you.