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A Point to Ponder - The Throw Down

In this series I am hoping to stimulate thought and discussion about geocaching topics that make me curious.
The Throw Down - Replacing a cache container when the original container appears missing.
When is this practice appropriate and are we doing the game a favour or are we doing damage to the game we all know and love.
I will be the first to admit I have done several throw downs and actually set out on at least one occasion with almost the sole purpose being to replace the containers of an inactive cacher. I have also been frustrated while caching when finding the containers left by others engaging in the same behavior. I know we can't have our cake and eat it too, so this is where my curiosity go peaked.
Would it be better to let the cache get archived or replace the container on our own whim.
Is it preferable to replace with an identical container in an identical spot or to better the cache with a different container hidden where we think is appropriate.
Finally, what if the old container is still there and we are just not really in the mood to look it. If this is our first attempt on this cache do we have the right or obligation to replace as we see fit.
I do not have the answers to any of these questions, and can not say if anyone really right or wrong.
What are your thoughts.