Seems dumb to me.
Prime example: 160" buck 50yrds away out of sight in the brush, headed your way, take a shot on a 2lb squirrel, it flops like a fish on the dry leaves, scares off your unseen buck.
Nobody buys a tag for a squirrel, and in most states, you can hunt squirrel a LOT longer during a year than deer. Get your priorities in line. You're out hunting deer, hunt deer. If you'd rather hunt squirrels and deer hunting is getting in the way of your squirrel hunting, then why carry the deer rifle at all, just go hunt squirrels.