Why does the Left have an instinctual response to blame the "Gun Lobby" whenever a mass shooting occurs?

Joe Biden delivered a speech following the mass shooting in Uvalde, Texas. He started out by saying we are all mourning for the victims’ families. Then he quickly became partisan, blamed the gun lobby for the shooting, and demanded new gun laws. What did you think of Biden’s address to the nation following the shooting in Uvalde, Texas?