Nobody wants the trouble involved with doing anything about it.
I figured as much. Either that or people are simply used to it, but I really doubt it. They're directly below an old grandmother and I've seen her staring at them when they're swearing loudly right below her balcony looking exasperated since this has been going on for so long. But even she doesn't call the cops or tell them off.
I thought about sabotaging their space, like hiding something that would smell really bad but unfortunately it would also punish the people living around there so I gave up on that. Talking to the neighbors will definitely be my next step.