Well that one was from last year -- but this is how I see it: On our property, there are PLENTY to eat -- I know they eat other vegetation besides what's being carefully grown in the protected garden beds. I also leave patches of what would normally be destroyed as weeds that I know they can and do eat. And then, besides mulberries you mentioned, there are plums and crabapples, hickory and acorn nuts if they care to eat them, wild grapes.... NOTHING within our property is sprayed or otherwise poisoned. I toss bug-eaten portions out on the open compost pile.
So if after I make what I consider to be reasonable amount of effort to indicate that THESE ARE OFF LIMITS and they still insist on stealing the fruits of my labor, I put the good kitchen scraps in enclosed compost bin, and step up on barricading, and even if THAT isn't enough, then trap and "relocate" according to DH's judgment. I will no longer "protect" them. WAR as the OP eloquently described the state of our non-coexistence.
(...and I refuse to feel bad about it...even if my conscience prickles sometimes