Killcam did not cause the server to crash, I have no idea where you would've gotten that idea.
Anytime a server restarts it reverts to default settings, once the server rCON is updated to fix that issue it wont happen. Same goes for any hardcore server, it reverts back the the default normal settings as well.
We turned the killcam off to experiment with different settings, just like we changed HC Laguna Presa to HC Arica Harbor. We will be trying out different configurations for some time until we settle on what is popular among the BC2 community, hence the reason we have so many rotation servers at the moment. We'll probably try out the new Conquest mode for Arica Harbor and the Rush mode for Laguna Presa when they're released at the end of the month.
I'm going to lock this thread now.