[gambiting]

No. Both children and drunk people can drive their cars whenever they want on private property. The government only says they can't do it on PUBLIC roads, because it's against the interests of the public. Your example would make sense if children and drunk people were prohibited from using their own cars even on private property, and that's not the case.

In some countries this may be different - in some eu countries if you cause an accident while drunk while on private property, you might be prosecuted.