I agree with him - any spirit contact requires protection. I have a ouija which I don't use regularly, but when I do I make sure I have a circle of light around me and that my Guide is on hand.
I think problems occur when people "play" with the Ouija (or any other tool) and also when people become addicted to it - using it every night.
I haven't used it for ages now because I need to work on connecting with the spirit myself.
When you use the Ouija you are not calling on a particular spirit - that's the problem, anyone can drop by.