Anyone can throw a ball straight down the lane and you can get a strike, but this style of play will limit most people to a 180 average. Throwing a hook ball is one way of scoring more.
Links Read about different styles of bowlers, how lane conditions affect ball reaction.
To say one style is wrong is insulting to those who choose to use it. Almost everyone who bowls probably learned with a straight ball to start with, because the other styles require skills which take time to practise and learn. A ball delivered straight down the middle is likely to leave a split . As the ball deflects it becomes harder to 'carry' all ten pins, you will be likely to leave the center pins standing. Many years ago someone conducted an experiment to find out what was the best way to strike.