ok here goes...
The reason you got a 5/10 is because the message your flash is based around doesn't make sense.
-How is being sad better then not?
-How is not smiling better then smiling?
-How does being sad make your heart stronger then being happy?
It doesn't make sense. Now if you message was that old cliche line "what doesn't kill us makes us stronger" then it would make a little more sense. I also don't understand why he imagines killing everybody. He is sad and he smiles at a dream of killing people? Im sorry dude, this doesn't make sense. I think these people are agreeing with it and everything because maybe they think they are the only ones who don't understand and don't want to sound stupid.
P.S.
If I'm missing something let me know. It could be me or maybe your just not explaining it right. But, again, I don't care about sounding stupid if you can respond and explain this to me.