King Cobra - S3-E6
Continuity mistake: When Miguel realises Johnny liked all Ali's photos, he looks embarrassed and shakes his head to the right, with his mouth open. In the next frame he looks significantly different, with his mouth shut. (00:09:23)
December 19 - S3-E10
Continuity mistake: After Johnny picks up the small spear in the dojo, the first spear (next to the one picked up) changes angles (tilting positions) every time it's shown during the scene.
December 19 - S3-E10
Continuity mistake: Tory's hair looks disheveled at the start of the house brawl. When she shouts "No Mercy!", her hair looks better. The intro must have been filmed after the brawl.
The Good, The Bad, and the Badass - S3-E8
Continuity mistake: In the beginning of the episode when Daniel and Johnny try to pick up Robby from juvie, the background shows that the weather changes in an instant. When they're arguing, it's raining. When Robby refuses their help, it's sunny.
December 19 - S3-E10
Continuity mistake: When Ali dishes about Johnny and Daniel's high school rivalry, she holds her wine glass in one shot but not in the next. It's noticeable even when the camera is not on her.
December 19 - S3-E10
Continuity mistake: When Ali dishes about Johnny and Daniel's high school rivalry, she is sometimes moving just one hand in one shot then it's both hands in the next shot.
The Good, The Bad, and the Badass - S3-E8
Continuity mistake: When Sam and Miguel are "fight flirting", Robby has his right arm around Sam and his left hand is touching her. In the next shot, his hand is no longer touching her.
Obstáculos - S3-E7
Continuity mistake: When Daniel and Sam are fishing, the way that Sam holds her fishing pole changes between shots.
Obstáculos - S3-E7
Continuity mistake: During the dream fight scene, Tory kicks Sam onto a platform. In the wide shot, Sam turns to the left after getting kicked. In the closeup, she's turned to the right.
December 19 - S3-E10
Continuity mistake: At one point during the first meeting of Vanessa and Ali, Vanessa is using a straw to play around with her martini glass. In the next shot, the straw disappears.
Answer: Just like in the original film, some guys want that brutality. Johnny in part opens the dojo because of his past rivalry with Daniel and to train a kid that's being bullied. But also, other kids that are being bullied want to join in order to learn to fight back. Johnny is also teaching the Cobra Kai creed (Strike First. Strike hard. No Mercy.") so that's why he opens his dojo with that name and the old Cobra Kai dojo's past reputation is exactly what he wants to elicit.
Bishop73