Usually something like "The only reason you want to do this is to have your character become more powerful and be able to have your clones take all the risks while you get all the rewards. You aren't doing this for character reasons...you're doing them purely for power gaming reasons. Right?"
Nope. Purely for character reasons. Who cares that my Wizard wants to have an army of Simulacrum to do things and take the risks while he gets the rewards. *That's the point of the spell.* In fact, in your example of a 'good' use of Simulacrum, that was exactly why he was casting the spell: to get a Simulacrum to take an ultimatum to the bad guy (that's a risk) while they stay back and scry (that's a reward.)
So, yes. I *am* doing it for character reasons and you even agree that it's a good character reason.