Disconnect battery when parked?

Lot's of controversy on whether it's a good idea or not to have a kill switch or disconnect switch etc. We have all heard the crazy stories where we ask "how could that happen ". So for me I believe the cost and inconvenience of turning on / off the switch is small compared to losing my cherished old mopar. Just like I have it insured in case something stupid happens. Better to error on the side of caution. You may disagree
Now what if your kill switch contacts start getting corroded or loose and you get a weak connection and while cranking, you build up excessive heat and it starts a fire.

Every time you flip a switch or disconnect a disconnect is one time less it can be connected or disconnected in the future.