I've no idea what you mean by a BS thread but, in my opinion, the real motive has nothing to do with "improving tourism" as this Tory led(Why do you always keep voting for them down there?) have claimed.

They have another agenda.

The Tories have NEVER agreed with this holiday which was first granted by Michel Foot during the 1974-1979 Labour Government to coincide with International Workers Day.
To them, it is a symbolism of socialist/communist ideals........ see this Tory woman here, for example
http://www.bbc.co.uk/archive/bankholidays/7111.shtml

This obviously doesn't apply to Scotland, of course, and we have to make up our own minds. However, I'd still prefer a May day holiday to having a St Andrew's holiday in November or a Burns one in January..... if it was a choice between one or the other.