I'm not confused at all.
The post that I included as an image above, is when and where you introduced the strawman argument.
That is the issue under discussion. Anything prior to or since that is irrelevant.
Now let's recall the sequence of events:
You said all murderers should be imprisoned for life, etc.
I asked about any mitigating circumstances being considered, such as age, provocation, etc.
Now at this point, you could have recognised your rather silly earlier assertion, and backtracked with something like: Oh yes, perhaps there might be some mitigating circumstances.
But, instead you introduced a strawman argument to cover your oversight.
Now going back to your rather naive oversight, would you consider that the three sisters who killed their abusive Father, for life imprisonment?
What about the abused wife who killed her overbearing controlling husband? What about the five year old child, playing cops and robbers with his three year old sibling, picked up his father's gun and shot his sibling?
I'm not suggesting that any of these incidents occurred. I'm simply using them as illustrations to show how ridiculous your suggestion was.