(that is to say, you're not a Knight or Paladin or anyone else morally opposed to subtlety)
Paladins might (or might not) find subtlety distasteful, but they won't (or shouldn't) find it morally offensive. They will, though, find assassins morally offensive.

One caveat, though: The very possession of such weapons might be illegal, in which case, depending on who the party offloads them to (whether for money or intangibles), they might have to answer some awkward questions.