KIND OR NAIVE??

I'm glad that I have a father whom I can argue to prove my point, unlike some overbearing fathers, who insist that they are always right, just because they contribute part of the DNA to form us. I remember on one ocassion where my dad and I were having our usual 'tiff'. I felt that he was being really unreasonable and unfair for scolding an innocent worker in the shopping mall. What my dad said afterwards was really a food for thought for me for the whole day and several days to come. He told me "Don't be too kind to people." This made me stop, not because I agreed with him but because it really struck me then and there, the essence of that sentence.
Am I too gullible and naive or am I too trusting? At the age of 20, maybe I haven't weathered enough storms and overcome enough obstacles to have doubts about people. All throughout my life, I have been surrounded by kind and trustworthy friends who have never betrayed me or done me any harm. As often as I've heard of stories of betrayals and backstabbing and catfights, I have never experienced those sense of betrayal or being backstabbed. It is little wonder that I find myself giving most of the people that I've met the benefit of the doubt. It makes me wonder if I'm doing the right thing. Should I be more careful in placing my trust and confidence in people? Or should I doubt every thing that other people, apart from my family members and close friends, said?
At the back of my mind, I know that life cannot be this innocent and simple. I'm certain that my fair share of betrayals, backstabbing and disappointment will come. It is these things that are going to make me tougher later on in life. No matter how prepared a person can be, when the moment strikes one will still be devastated and disappointed. I only hope and pray that I wouldn't be the one that is going to inflict this pain upon others. I shudder to think that later on, at 40, I would have encountered enough of these experiences to be telling my kids to not be too kind to other people.