To me it sounds more like he really wanted to give them some agency and the ability to speak, but then was unable to resolve the moral dilemma that came out of it - with different works suggesting different "solutions" to it. As the Wiki article points out, Tolkien was a devout Christian and part of his world view included beings which were wholy and irredimably evil while still able to speak and reason on some level. When you look at Christian iconography, you don't really have theologians saying "well when you have angels slaying demons, are the demons really evil or are they just misunderstood". That's your orcs. Since Tolkien really cared about world building he wanted to make it fit neatly in the myth of creation but as far as I can tell - he was never able to do it neatly.
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To me it sounds more like he really wanted to give them some agency and the ability to speak, but then was unable to resolve the moral dilemma that came out of it - with different works suggesting different "solutions" to it. As the Wiki article points out, Tolkien was a devout Christian and part of his world view included beings which were wholy and irredimably evil while still able to speak and reason on some level. When you look at Christian iconography, you don't really have theologians saying "well when you have angels slaying demons, are the demons really evil or are they just misunderstood". That's your orcs. Since Tolkien really cared about world building he wanted to make it fit neatly in the myth of creation but as far as I can tell - he was never able to do it neatly.