Why would I do that?
It means the same as why would I ever do that.
For example
Did you steal money from my purse?
Friend: why would I(ever) do that?
What does why would I have done that mean however. It doesn't sound wrong tho but doesn't mean the same either
Why would I do that? This refers to the past, present and future. Why would I have done that?
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Why would I do that? This refers to the past, present and future.
Why would I have done that? This refers only to the past.