Ethics refers to the value judgments one places on behaviour. Ethical questions develop when a researcher claims another persons work as his/her own, or when the data is distorted or falsified to cover up unwanted conclusions. In many cases involving studies that address issues of child development or behaviour, the researcher own biases are sometimes ignored or not even recognized to exisit. The studies of child develpoment all start from the built in predujices of our own childhood development. We were all children, once. When one collects data, bias is always present. The larger the data sample, sometimes gives conclusions or insights that have a wider application. Peer review of ones data, and the conclusions drawn from that data are one way of minimizing bias. From my own experience as a parent and a teacher, I have not seen very much that has been helpful in studies that claim to project conclusions about child psychology and development.
As a teacher, acceptance of the individual and attempts to communicate with the individual are very much individualistic. I have seen teenagers who were written off, become wonderful investigators of the world around them, and have been thrilled by the contributions they have made to the society around them.