This is EXACTLY what I was going to say. Swear words are NOT a crutch and it's not lazy to have them in your script, at all.
The question is, would this character use the words you're writing? And that goes with ANY dialogue. When I first started writing around 25 years ago, a big problem I had was that I tended to write all my characters' dialogue in my own voice. That led to long, over analytical prose with all the character's sounding too similar. It wasn't until I started to learn how to develop my characters that I was able to write in their individual voices. And that affects what they would say.
Example:
You have young, meek girl working her first job as a secretary for Mr. Smith. Smith has her stay late one night for the purpose of hitting on her. When she rejects him, he tries to force himself on her. What is she going to say to him?
Something like, "Mr. Smith, please stop. You're hurting me."
Mr. Smith persists. "I said no, Mr. Smith. Please, etc..."
But take the same situation, only with a tougher, more experienced woman from the tough part of town, and what will her response be?
"Mr. Smith, please stop. You're hurting me."
Mr. Smith persists. "I said, get the f*** off of me!"
Same situation, but different characters would warrant different responses and different dialogue. It's not lazy to put in the F-bomb. It fits the character saying it...