I think my message/tone probably doesn't convey well in text... but if you'll look at my post earlier, with the screenshot from my UPS account, you'll see that you can authorize UPS to leave the package at a given location at your home. I have designated my front door as it's tucked well under my front porch. By authorizing them to leave the package you transfer all responsibility to yourself (barring damaged goods I would suspect). If the package is stolen, now it's on you.
When I say it's on UPS, I'm saying if you have done the authorization for UPS to leave the package without a signature and that's not happening... then it's on UPS or more specifically the driver of the route that day. UPS does say they can leave it or not leave it at their discretion based on inclement weather or if they feel it would be safe to leave it, that's still UPS making the call, not MD. I guess you could argue semantics for one way or the other... but that's my take.