Completely agree, I wasn't present for the previous two so I was dumbfounded to say the least. Zombie event + can't KOS zombies is the dumbest combo I've heard in a long while.
With the current ruleset, event boils down to "Run from zombie, only kill zombie when it's tried to infect you. Oh, and it only takes one hit to infect you, and undoubtedly a horde of them will probably chase you, so unless you're able to kill 5 zombies next to you immediately you're basically fucked"
Additionally, survivors with most zombie kills should also get a reward along with zombie with most infections, that's just how a zombie event should work.
If the issue is random bystanders being spawncamped and killed, then literally just let them opt out of the event, problem solved. Revert them to human then paint them blue or some shit when event happens. Zombies won't be able to infect/damage them, and if they shoot zombie they're opted back in and can't opt out