I think that as our knowledge of the world expands, our view of the world changes and so our views on morality change. WHat is moral 100 years ago is no longer moral today, because we know better. I also think that as our siutaion changes, the types of action we will tolerate change.
This can work both ways - for example, pre 9/11 I think very few people would have considered the prisoners of Guantanamo Bay, secret military tribunals etc as acceptable - but now people are a lot more scared of terrorism - so they are prepared to accept a lower level (IMO) of moral behaviour from their government in return for increased safety. So as the environment changes, so does morality.
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People have said to me that the British Empire did nothing wrong because morality didnt exist, and everyone was trying to do it
okay _ i'm going to have to debate this one, because I'm from Britain ....
at the time, the actions of the British Empire were considered extremely moral. It was perceived that there was a 'civilised' world (Europe and N. America) and an 'uncivilised' world (everywhere else). The 'civilised' world had developed technologies, financial systems, a degree of democracy, literature and was Christian. The uncivilised world had less technology, feudal systems, lower levels of health and was pagan (i.e not Christian).
There were many theories as to why this was, but the accepted theory (in Europe and N. America) was that white men were the most advanced, followed by Asians, then Africans, who were the least developed. The British Empire felt it had the 'white mans burden' - that it was morally incumbent upon Britain to take over the running of Asian and African countries to improve the quality of life of less civilised peoples (and to spread Christianity). Implicit in this belief was the assumption that they were incapable of running their own countries and that their own religions were false.
Nowadays we regard the assumption that white people are superior to other people as being repellent...however the world is a different place today. We can see Asian and African countries with democracies and the technological divide has greatly narrowed, so it is an obviously idiotic notion to say that any race of peoples is superior to another. But this view of the world did not exist 150 years ago, because the technological divide between the 'West' and the rest of the world was so great that people felt there had to be a reason.
So it wasn't that morality didn't exist - but that morality and ethics can be fluid and much more subjective than people think. Europeans consider the death penalty to be hugely immoral. Americans do not (or at least the majority do not). Can we say that anyone is right or wrong here?