Should I hate them?

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I would like to share an experience with you yesterday on our way home. My wife and I ride an Fx. Since all the front and middle seats were already occupied, we sat at the back of the FX. On the other side, there's these two lovers who were doing things which I felt very disgusting. They were torridly kissing each other. Holding each others sensitive parts. As I look at them, I saw that they were very too young for that ( I guess the both of them are just in 1st year of college.) I have nothing against them, but I just felt bad for them? I also felt sorry for their parents... What do you think, should I hate them???