> Why didn't they simly replace the original bad one?
Starting with version 2.1 they made it so that code points can't ever be unassigned. People were getting really upset with the removals, since they can result in old data being misinterpreted. (Er, nothing actually was removed in 2.1, but it probably didn't become official policy until 3.0… ?)
Besides, it's useful to have the bad characters in there for people who want to write posts like this one discussing them.
But it's even more useful for people who want to use the actual character to be able to use it! And you can discuss using other means, not like drawings or old standard data disappears Weird absolutism re error preservation instead of striving for correctness