Why should one express Emotional opinions on a scientific subject?

I saw this Question about a completely scientific subject and saw people's emotional approach when commenting on it :

www.girlsaskguys.com/.../q1037907-what-do-you-think-of-mixing-races

my suggestion is to remain silent, or, if you want to express your comment have a completely solid one backed up with knowledge. but "do not" express your simple emotions. it will only strengthen your ignorance and will destroy you in the end, even though you feel good right now saying it.

And i do not argue with anyone.
Why should one express Emotional opinions on a scientific subject?
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