If being (more broadly) useful for self-defense would be a desirable factor in making this selection, I add my vote for Judo or Brazilian Jiu Jitsu.
Both of those give the practitioner a lot more options for controlling an attacker without hurting them too much, compared to Karate/TKD. Also vastly less chance of getting a head injury while training or competing.
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If this Meta AI chatbot didn’t exist, this man would most likely still be alive right now.