Good guy?Bad guy?

Just now watching a show wif kiddie. Scene shows policeman catching bad guy and also scences of policeman and wife divorce, wife cries.

Kiddie: Why this guy beat the other guy?
Me: One is a policeman, the other is the bad guy.
Kiddie: That guy didn't wear police uniform, how u know he is a policeman??
Me: erm...!?!?!?!
Kiddie: The other guy also didn't say he is bad guy, how you know he is bad guy???
Me: erm......!?!?!??!? The things they do will reflect if they are good or bad. Good guy will not steal and kill ple mah.
Kiddie: Then how I will know which one is good and which one is bad? Will they write it on their foreheaad so that I know next time?
Me: *laughing helplessly*......Kiddie, this will depend on your own judgement. No teachers nor parents can teach you this.
Kiddie: ??????? *face full of puzzle*

Gosh, the questions innocent youngsters posed are so prfound!

Kiddie: Why that jie jie cry? (wife of policeman)
Me: Cos ge ge bully her lor.
Kiddie: Why he bully her?
Me: He scold jie jie and hurt her feelings.
Kiddie: What is "hurt"?
Me: Erm, make someone sad and heart pain. Like you today, fell down and alot of bruises, me see already heart pain......
Kiddie: * after serious thinking* if you got bruises will I feel heartpain also??
Me: !?!??!?!??...........ehahahahha.......

Sigh....how to explain??ehahhha....