Making decisions is hard and you should always be able to justify the thinking behind a decision.
We all tend to look at things from our own point of view but in the real world you need to consider different issues.
When you look at the evidence in front of you:
Ethical decisions should consider the advantages and disadvantages from different ethical viewpoints.
Utilitarian – 'The greatest good for the greatest number.' A bit like Homer Simpson this is a pragmatic, rational approach, looking at who is affected by the decision, and weighing up the benefits and costs. There are no moral absolutes here.
Rights-based – 'Do unto others as you would have them do unto you.' A bit like Lisa Simpson this approach respects others' rights: right to choice, truth, privacy, not to be injured and so on. Decisions are wrong if they violate individuals rights - the more they violate, the worse they are.
Care-based – 'What would a virtuous person do?' A bit like Marge Simpson this emphasises the importance of compassion, maintaining relationships and tending to the needs of others.
Self-centred – 'What's best for me.' The Bart Simpson approach! This of course is the unethical approach; a sign of adulthood is the ability to consider a problem from different perspectives.