And not to mention O Sensei... reading back to his early days, he certainly wasn't a "nice" teacher in any way. In fact, many of the training methods would probably be illegal today, or labelling him insane (training with live swords during night time?).
OSensei's early days students were experienced martial artists who had to gain admittence to the dojo.
A far cry from his later desire, carried out by his son, to explicitly bring aikido to the masses.
The OP wrote: "the sensei that threw a small young beginner female, who cleary wanted to gain confidence and fitness by doing a softer marital art, so hard that she bounced and took pleasure in making poeple scream."
That is not an environment in which people actually learn productively. They learn tension and fear.