Not me but my SO is a black belt judoka. He started as a kid and kept on practicing all the way through college where he managed to train and compete as a professional. Went to one edition of panamerican games and scored a first place.

My FIL is also a black belt judoka and at one time him and my SO taught classes for beginners and advanced students alike, they even had a class for little kids with some behavioral issues. They were beloved teachers by many students.

At one point they even had a student with impared vision and a student with impared hearing and that never stopped anyone from practicing judo safely and learning techniques.

Regarding your bit about using martial arts as self defense, I think it is more of a hollywood idea. Noone is faster than a bullet so good judgement is better than any martial art.

My SO has taught me that "It is better to be a warrior who can garden, than to be a gardener who has to go to war" and he is the most level headed, peaceful individual you can imagine.

He also says that judo is the discipline that has shapen his whole life through "Jita Kyoei" and "Seiryoku zenyo": Mutual benefit and maximum efficiency.