Its not that the above posters don't believe the rules are for them.
It's more a spirit of the law vs. the letter of the law.
If your dog is left alone but is well behaved and quiet no one knows the pet is there and no one is disturbed.
If the dog is not well behaved and disturb others the rangers can apply the unattended rule accordingly. There is no need to debate the dogs behavior since just being unattended is a violation.
Very similar to alcohol rules if your group is drinking alcohol and disturbs others you are in violation. No need to debate how loud or how drunk your group is.
In either case the authorities are not actively looking for unattended dogs or alcohol. Only misbehaving dogs and people will appear on the rangers radar.
Those who behave will fly quietly under the radar which is the desired result