Using KDA as justification

I was in a game last night where every lane was doing well except bot lane. They fed horribly because they kept getting snared and ganked due to extreme pushing, even though they were given advice to maybe let the enemy team push the wave near our own bot turret.

Anyhow, I was getting sick of our adc not really doing anything in teamfights when our tank (boyfriend) soaked all the damage and had the expectation that our adc would focus and actually do damage to targets. When I told her she needed to actually participate in teamfights and not just run from them, she said "I'm 11/8. I'm doing something."

No, last hitting kills that I snared and ulted, or mal ulted isn't really doing much. You "helped", but don't use your kda as justification as you did a lot. Kda doesn't tell the entire story.

Maybe it's just me, but do you think bad players should use their kda as justification for bad decision making?