You have a friend whispering in a huge room. You are close and you can hear the secret clearly. You stand in the room and can hear them bounce off the wall.
It does not matter as long as no one enters the room.
No matter where they are in the room, this new stranger can hear all your secrets.
How do you solve this problem? You will make a lot of extra noise.
This is basically a signal jammer. Interference will generate enough noise based on the type of signal you want to block to scatter the rest of the noise onto that wavelength.
Think of it this way: If you bring a group of people into this big room, the whispers will be drowned out. Some distractors behave like a screaming person screaming in the ear of the person trying to listen.