I think there's a big difference between the term paparazzi and press photographers. The former are photographers who sneak around against someone's privacy ( like in some celebrity's home,etc) to snap pictures of them and sell to the tabloid.
In the case of jack Neo's press conference,most are bread and butter press photographers who have permission to be there.
As for the shoving ,who can blame them when all hell break loose-it's called the mass hysteria effect. They are just doing their their job.It will be considered overboard if they shove and push his wife or manhandled the security .Seem like they were just shooting as the action follows. Which photographer would have just stood there ,not doing anything when the wife fainted?