I disagree as well!
In order for an accident of the specific type that I referred to, (i.e. lock jumping) people must be present.
These people must also be prepared to take part in behaviour that is clearly dangerous, and could result in injury or even death. Most people do not take part in this kind of behaviour for obvious reasons.
Certain groups of society that are more likely to take part in this dangerous behaviour; for example,children, adults under the influence of drink or drugs, young people trying to look "macho", or to impress the opposite sex.
So it is clear that the risk is higher at locks that are located in areas where these types of people might congregate.
Isolated rural locks are less likely to be places where the dangerous behaviour takes place as very few people live nearby; therefore the risk is lower.
And you are right - your aeroplane analogy is bad.