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Since posting my previous message, quoted below, I have found the following
among the definitions for "capable" in the online American Heritage
Dictionary:
3. Having the inclination or disposition: "capable of violence."
From my previous posting:
The word "capable" can express a connotation, an ethical, moral, and/or
emotional structure in the
object it describes, that the word "able" cannot. For example, you can say
that someone is not capable of committing a certain act (such as a crime),
whereas that same person may certainly be able to do so.
The online Merriam-Webster doesn't refer to this meaning of "capable", only
to its overlap in meaning with "able".