1. Negative state relief hypothesis: States that we help others for the egoistic reason of assuaging our guilt.
2. Similarity bias: We are more likely to help those who are similar to us. In general, situations – such as whether the person in need of help is similar to us, or attractive and the presence of bystanders – influence our likelihood of belong someone
Ultimately, we help for four key reasons: egotistic motives, situations, altruistic motives and biological factors.
– House and Psychology