A Sydney father who confronted an intruder who subsequently died had previously commented that he had no sympathy for thieves who were caught in the act.

A Reddit social media account, linked to Harrington Park resident Johan Francois Schwartz, commented on a video showing an alleged mobile phone thief being held and pulled alongside a car by someone in the vehicle.

Francois Schwartz had previously indicated that he had no sympathy for thieves who were caught in the act. Credit:Facebook

The thief, whose hand was in the car, is repeatedly punched in the head by those said to be the potential victims of the theft.

"If he is committed to crime, he will next time bring a gun and target someone more vulnerable like an 80-year-old," the Reddit comment, made on February 3, states.