
It's fine to bend the laws of physics if the plot warrants it, but most suspension bridge mistakes are so needless and stupid that their only function seems to be irritating engineers.
Most of the structural elements have no purpose, and bridges are instead supported by a mix of perplexing whimsy, directorial ignorance, and nothing. I've taken a look at some notable suspension bridge disaster scenes and listed them from least bad to most bad:
Well, why not? Magic can do what it likes, but we know how bridges work.
This guy should watch San Andreas. They went another route and flipped a cargo ship end over end on top of it. It was pretty epic.
The suspension bridge which is a small plot point in "I Robot" exhibits similar strangeness
"I'm inside a tank / armored car / steel suit. I can free fall from a mile high and I won't be harmed."
Superman lifting a plane with his tiny human-sized hands without toring a hole in it.
Hulk grabbing a tank from its main cannon and tossing it.
Every time someone is allegedly "saved" from falling to the ground by a superhero slamming into them with orders of magnitude more force than the ground would have.
Yes, YES.
Thirty years ago, one of the writers explained the Superman issue by more or less decreeing that all his powers came from subconscious telekinesis. As a wise man once said, "now you've got two problems".