Okay, so let's adopt 'ought implies can' then, and restrict it to the same tense: if I ought to do X, I can do X. If I could have done (but can no longer do) X, then I ought to have done (but no longer ought to do) X.
How does this, in connection with MW, interact with consequentialism? The consequences of my actions can't determine how much murdering I do (in the big world sense), just whether or not I fall on a murder-path. In the big world sense, I can't (and therefore ought not) change the number of murder-paths. The consequence at which I should aim is the nature of the path I inhabit, because that's what I can change.
Maybe this is right, but if it is, it seems to me to be an oddly subjective form of consequentialism. I'm not sure if this captures my thought, but it seems that it's not as if I'm making the world a better place, I'm just putting myself in a better world.
The consequences of my actions can't determine how much murdering I do (in the big world sense), [...] the nature of the path I inhabit, because that's what I can change.
I'm not at all convinced that I endorse what you are doing with the word "I" here.
If we want to say that there exists some entity I, such that I commit murders on multiple branches, then to also talk about "the nature of the path I inhabit" seems entirely incoherent. There is no single path I inhabit, I (as defined here) inhabits all paths.
Conversely, if we want to ...
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