Plain and simple, rules were broken, the admin handled it poorly. Having a non-main rush the map at the end because only a few ppl were incapped (not everyone) is against rules. Now lets say the admin allowed it...all that did was allow for that team to purposefully lose when they were survivors on the last map.
If I remember correctly, there was a thread that said we should get rid of the final score just so players don't rage quit or teams don't feel stacked.
Both teams were pretty even up until the 4th map. The finale was when my team finished with enough points to solidify the win for us, but it doesn't mean we don't want to play as infected and try playing against the (losing) survivors fairly. I think it would have been better if the admin had just set up a vote for talpa challenge or just to skip the map. Like I said when the survivors made it to the ladder, Tainted slayed all of us waiting on the roof. When the first survivor made it to the top, all he did was jump off the fence and he hung there so we couldn't spawn. I don't know if that's a tactic or not, but the slaying of our infected team was when I decided to report everything...the name changes, the rushing and the slaying.