Its .8 because suicides count against your overall K/D which makes 1.0 above average.
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ummmmmmm. I highly doubt that 20% of all deaths are suicides. For example, depending on the game type, if there were 100 total kills, there were 120 total deaths, with 20 of those deaths (in one single pvp match) being suicides?! Please. That does not happen.