I can confirm the Contract killing can be countered. When I set out to take down the entirety of the TWs, it was tricky to even get the three folks we did kill, killed. Partially my own schedule, partially Things Folks Did, to prevent us from executing individuals. That's almost one reason I enjoyed the two we did manage to kill off, beyond the first "surprise!".
I can't speak towards OtherArmy or any of that, as I am not a combat-oriented person here.
However, being dead myself a few times, I think that there is ample opportunity to interact with the community, with the caveat of IF The Community interacts with you.
I can't recommend any new mechanics or such, really, as I agree with the current situation, but do think that most folks who are "killed" are not new folks who would have fewer "friends" to contact and help out. This is good.
That being said, if the person killed was "unpopular", and that definition is up for debate, it's rather easy to make their life frustrating by killing them, not reviving, and letting them deal with Molquert and such alone.
As DD stated, this is fun, the first few times.
Guess I don't have any real answers to add to the topic, other than to state that I see some potential weaknesses it the current system, but overall Agree it is a good system for most and does not really need too many changes, IMHO.
c'est la vie.