Have you read a comic? Smashing someone through a wall or bashing them with a car is part of the lore.
Yes, it's part of the lore. yet, Injustice makes those transition or stage attacks way too powerful and it unbalances the game. What makes it worse is that some of the characters have no attack with stage objects they just jump off them, which further unbalances the game and the character list. Each character should have a way to attack with stage objects and as a fighting game company they should have known that it was going to unbalance the game.
They could have kept the transitions and stage attacks in the game, but lowered the damage significantly if they wanted to have that type of action happening in a fighting game.
Those attacks just pack way too much of a punch and are super easy to pull off which makes it the worst part of the game for fighting game fans.