The most important moral issues arise for most ethicists when human beings come together in

The answer is - Social Groups

Explanation:

An ethicist can be seen as one whose judgement on ethics are accepted and trusted by a specific community and is expressed such that others are able to mimic that judgement. Ethics or ethical code refer to moral philosophy or moral codes that are practiced by an individual or a group of people.

A social group consists of two or more people that interact with one another and share similar characteristics or values and have a sense of unity.

Peer or social groups have great influence on ones ethics or values. The characteristics or ethics a peer or social group is known to have can be adapted by an individual that spends much time with the group or becomes a member of the group. This brings about moral issues for most ethicists when individuals gather in social groups.