The fact that most of these words are slang for a "normal acts" we humans do makes them "so bad".
Because if you think about it the use of slang isn't seen as proper use of the english language. Especially in the old days it was taboe not to use proper english and slang was only used by the (how to put this nicely) the lower classes within a community. But a proper lady would never ever use slang.
Because nowadays (read over the last 30 years) we don't really see the use of slang as being a terribly bad thing because face it slang streamlines a conversation you can say a lot with just a few words and everyone that should know what you are saying knows and all the people you don't want to know (read parents) mostlikely won't
But still a bit of that proper use of the language has stuck in people's minds. And these taboe's once made up by older generations still stick only with a different value. Because your fokes have learned from their parents not to say certain words this list of words that you can't say has slightly been modefied over the years and added to your upbringing by your parents.
So the fact that some words where taboe to use in the old says make them still "not done" now. Because there are effectly good ways to say most of the things you say with the use of slang that is generally accepted as being the standard.
Its all about what is seen as the general standard and how you conform towards that standard.
To come back on your murder and stuff. Yes they mean things that are a lot worse but as you will probably know there are a whole set of words to say murder. Where murder is the generally accepted word to use and some other words aren't and therefor have to be marked as "BAD!" (in other words seen as a swearword)
Ok I just hope this made any sense at all
Because if you think about it the use of slang isn't seen as proper use of the english language. Especially in the old days it was taboe not to use proper english and slang was only used by the (how to put this nicely) the lower classes within a community. But a proper lady would never ever use slang.
Because nowadays (read over the last 30 years) we don't really see the use of slang as being a terribly bad thing because face it slang streamlines a conversation you can say a lot with just a few words and everyone that should know what you are saying knows and all the people you don't want to know (read parents) mostlikely won't
But still a bit of that proper use of the language has stuck in people's minds. And these taboe's once made up by older generations still stick only with a different value. Because your fokes have learned from their parents not to say certain words this list of words that you can't say has slightly been modefied over the years and added to your upbringing by your parents.
So the fact that some words where taboe to use in the old says make them still "not done" now. Because there are effectly good ways to say most of the things you say with the use of slang that is generally accepted as being the standard.
Its all about what is seen as the general standard and how you conform towards that standard.
To come back on your murder and stuff. Yes they mean things that are a lot worse but as you will probably know there are a whole set of words to say murder. Where murder is the generally accepted word to use and some other words aren't and therefor have to be marked as "BAD!" (in other words seen as a swearword)
Ok I just hope this made any sense at all