Regarding child abuse, common sense is my answer. You don't accept it. That's your prerogative.
Same with murder of the elderly. We're not talking about whether something is illegal. Things that are illegal are not always immoral. You say it's not immoral to murder the elderly. I say it is. My rationale is common sense. That's all I got for you. Take it or leave it.
The problem is that "
common sense" isn't really all that common, and what's worse, it can be used to defend anything. I'll show you:
It's common sense that people who have mental handicaps that prevent them from being productive members of society will not be able to support themselves and will require assistance either from the state or from individuals. It's common sense that these people are burdens, even if those who carry them right now don't see them as such. It's, therefore, common sense, that those with mental handicaps not be allowed to be a burden on anyone. This necessitates euthanizing them. It's just plain common sense!Now, you could have said that the abuse of children is immoral because the initiation of violence is inherently immoral. Similarly with the elderly you could have argued that the use of force to compel someone to act against their own judgement is inherently immoral.
But you didn't. You argued that "common sense" dictates this. And my point is that common sense is something that's very culture-dependent. Sure, in the western world we frown upon killing our teenage daughters for wearing mini-skirts or holding hands with a boy, and we consider it "common sense" that one doesn't do such a thing. But a few thousand miles away, and your common sense isn't all that common.
Perhaps common sense is good enough
for you, but I'm pretty sure that you'd be the first to condemn the killing of a teenage girl who held hands with a boy. The bottom line is that "common sense" cannot be the basis of an immutable and universal morality.
Regarding the individual as the victim, it's not a specious argument to me. I actually like it. What's specious, IMO, is saying doing something "freely and without compulsion" isn't violating your conscience. Most acts are done "freely and without compulsion," good, bad, or indifferent. And they all have consequences that are good, bad, or indifferent. If a person believes he should not engage in certain conduct as a matter of conscience, but "freely" engages in that conduct anyway, of course he's violating his own belief system.
A person who engages in certain conduct that he believes to be immoral without being compelled to do so is lying - either to himself or to you - because he doesn't believe. And you can't violate a moral/ethical code that you don't believe.