Comment by Hapa

I would say it is because there are many branches of ethics and not every one is consequentialist as you seem to be. Meaning that some people think that what is or what isn't ethical depends of consequence.

Other group - deontologist believe in some rule or sets of rule and they might not be concerned with consenquences that much.

Famous trolley problem describe this idea nicely.

Obviously this is problem on its own.