Rather than take the "horrible consequences" tack, I'll go in the other direction. How possible is it that something can be deontologically right or wrong if that something is something no being cares about, nor do they care about any of its consequences, by any extrapolation of their wants, likes, conscious values, etc., nor should they think others care? Is it logically possible?

a rights-holder may, at eir option, waive any and all rights ey has, so uncoerced suicide or assisted suicide is not wrong...the would-be murderer who doesn't know his gun is unloaded.