When it comes to dream catchers being good or evil we only need to look at one thing. Do they actually work and if so what on earth is controlling or giving it the power to stop bad dreams.
Are they good
The reason many people think they are good are simply as they come across as a spiritual item that can protect adults and children from bad dreams. Many people have said dream catchers have prevented their bad dreams since using them and regarding them as a positive force.
Are they bad
Dream catchers are from a period long ago where black magic and rituals were an everyday occurrence. Therefore there was some bad nature to them and have a lot to do with preventing evil spirits and attracting them into your home. Many people believe that evil and bad dreams are stored in your home and therefore are bad to have around, the only thing that can prevent this is changing your dream catcher every few years/months.