I think luckyme's position is that most of the statements made here don't represent wffs, and therefore can't really be considered logically inconsistent.

My original interpretation of the OP's problem assumed a situation like this:

All killings are wrong. All lethal acts of self-defense are killings. In this clase claiming that a "self-defense killing" isn't wrong would be inconsistent with the previous statements (all self-defense killings must be wrong).

Unfortunately, the language used on a message board forum has to be a bit vague. Going into exact detail would take too long (and would be arguably impossible). And when the definition of a term changes with the wind, it's really hard to pin it down into any sort of formal context.