Not completely their fault. When you create a new topic using the button which is usually on the top right, it will default to the News & Updates section. Many users simply forget to change it.
Although I agree users probably don’t need posting permissions in that section, a more immediate solution could be to simply see if we can set the default section to Questions & Comments. That way, if a user forgets to change it, that is where it ends up.
I believe I have suggested this a while back.
If you should see such threads, feel free to flag them off-topic and RVC or myself will move them over.
And thank you for the suggestion!