Yes, because what we see and listen too is what we do! Here's an example: Jonny has been hearing a not so appropriate word every single day and every single night, well, because of this John is now saying the not so appropriate word! He says it because he's hearing it all day long! Now the last parts mostly your opinion! But my opinion is yes! Because if we stop watching violence, if we stop listening to it and whatever else we won't have that bad example going through our brains!
Does that make sense?