It is true that most random Joes/Janes won't be interested in stealing your ideas but the issue is not about them. It's about your competitors who are already

It is true that most random Joes/Janes won't be interested in stealing your ideas but the issue is not about them. It's about your competitors who are already in/near your space, who definitely want to see what others are doing and thinking. If you are not careful who you talk to, there is a chance that your ideas may end up in their hands. Beside, I heard that in EU and Asia, if you disclose your idea to anyone without an NDA, you immediately lose the right to patent it. So don't be naive to believe in Cinderella fairy tales.