As the SE is about Craft I don't really think the tag is needed, but would be good to hear all your opinions on this.
Thanks Jamie, I totally agree! It's a little silly and redundant for any question on this site to be tagged with craft. I had thought that only some spam, or ill-conceived questions, were using those, but the link you posted demonstrates that it's more widely used than that.
I've just done some quick searching, and unfortunately it's nearly impossible to blacklist specific tags. While technically it can be done, it apparently needs direct intervention from SE developers, and we're better off just manually killing off that tag wherever it appears.
That being said, feel free to re-tag each of those questions however you feel is appropriate! :)