When we are assessing our children's safety, it is important not to be guided by fear. It is easy to see danger all around, but your child will not benefit from being constantly restricted. It is important for a child to have a decent amount of free roam, adapted to its age, of course, in order to make choices and mistakes of its own.
When we guide our children through fear, all we are teaching them is to be fearful themselves. If we are constantly screaming 'No' in a fear-installing way, they will be conditioned to look to us before they attempt anything. This is not what we as parents should want to obtain.
We want to raise strong, opinionated and independant individuals, yet by installing fear, we can do no such thing. Fear is probably the most dangerous, sickening and paralysing emotion we can transmit to our children, so it is best to be very watchful of it.
If you have difficulties assessing a situation, ask yourself: is my child in immediate danger? Is there an imminent risk to my child's health or sanity? If not, allow your child to be well, a child.
Reach into yourself to discover why you are reacting so restrictive? Is it out of your own deep-seeded fears? Where do they come from? Is there something you can do to deal with those fears?