Well, yeah! I’ve taken karate through the years and have obtained a brown belt. That is meaningless to a guy twice my size (and I’m only 5’0”). I might could cause some damage and get away.....but hand-to-hand combat.....no way! I’m not naïve like these morons.
Never believe what you see on TV or in the movies.
Not to mention if they are hyped on drugs which, in certain circumstances, increase their strength as they are oblivious to pain.
My petite 15 year old daughter has taken karate classes for a number of years, I sometimes go to her classes. There are about a dozen kids in her class and 9 instructors, most of whom are big muscular men. There's a little 6 year old girl in the class, it's almost comical to watch her paired with the biggest instructor there.
I do believe however, that my daughter is learning valuable skills.