There are 2 ways to look at this.

1. Having the cap means IF the person keeps dying, they are just feeding/losing points.

2. The person even while dying, are providing benificial things for the team. This would include absorbing CDs/LBs/stunning healers and DPS/ stopping people from capturing nodes.

I personally hope that the person who is dying is because of reason 2 most of the time, so I just bare with it. My issue is when I see melees doing with 0 kills by the end of a match. Usually in a match, a person should be able to LB twice, thats almost a guarantee kill atleast once.