The reason for the K/D/A bars has been mentioned in another thread before already. Kills are read because the red is a strong signal colour and you'll notice it first.
I really like the color scheme used in Ansom's link. I think kills being green in it does not take anything away from it catching people's eyes.
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Go to your profile. The top right shows your win and loss in green and red. That's expected. Yet, look at your MOST PLAYED HEROES and RECENT MATCHMAKING MATCHES. WINS are green, that's expected, yet the bar for MATCHES is red, the color you expect for LOSS. I suggest changing MATCHES to white.
Then look at the KDR meter for your matches. KILLS are RED. DEATHS are GRAY. ASSISTS are GREEN. RED is a negative color in this scheme, so why is it being used for KILLS here? The KILLS bar should be GREEN. DEATHS should be RED. Assists should be WHITE or GRAY.
Here's what I think it should look like: http://i.imgur.com/McnEZ.png