Originally Posted by TDK010
This is a question that can be levelled at any movie after a massive team up movie like The Avengers or if there is even a Justice League movie. People are always going to be wondering when the stakes are high for each individual character, why it is they don't get help from their teammates. Difficult to justify really.
Sometimes a police officer can handle a situation by themselves. Sometimes they need to call in for backup. Sometimes the police department needs to call in a SWAT team or even the FBI.
There's different levels of threats, and each can be handled by varying degrees of response.