how do ethical implication increase with the ammount of influence you have?

Answer 1

I'm not certain I understand your question. But I believe you are refering to the issue of propriety. If so, the belief is that influence, usually associated with money and power, two things that are often hand in hand, puts a high responsibility on a person whom has either to limit his influence, as it is greater than that of the common man. It is thus greater because people tend to be motivated more by fear and potential wealth than principles, or so some believe. The powerful have an advantage.

Answer 2

With great power comes great responsibility.

(With no power comes no responsibility)

Seriously - if you kill someone as an adult you can be held responsible for carelessness ... eg reckless driving

A child is considered incapable of making such decisions and if a child hops into a car and kills someone they are not subjected to the same degrees of punishment - at least not in Australia.

Teachers and their students, doctors and their patients, priests and their congregation are supposed to have a relationship or interaction based on their roles. It is considered the responsibility of the person in the senior/superior role to ensure things go well.

Nobody ever accuses an altar boy of seducing a priest (and this is considered very unlikely). We see examples of teacher-student impropriety and usually it is the teacher who is thought to be the instigator. In any case, even when the junior in the role is the initiator it is expected that the senior (with more influence) is able to shut down the pursuit of the wrong pathway and redirect things to a more proper way.