I'm not sure you should delete them - just flag them as spam and report them here - that way others can see and decide if they deserve a spammer report on the poster. Which helps to get rid of them all the quicker.
If the text of the offending messages is deleted, then we have to assume that whoever did it is truthful. While I'm sure you wouldn't try any such shenanigans, there are a few people I wouldn't trust...
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
I was going to ask this very question - if we should delete these spams or not? I always thought why should be bother the admins here if we can help them just by a click. But your post has a point and I won't be deleting them from now. Thanks!
While I'm sure you wouldn't try any such shenanigans, there are a few people I wouldn't trust...
Panic, Chaos, Destruction. My work here is done.
Drink. Get drunk. Fall over - P O'H
OK, I will win to day or my name isn't Ethel Crudacre! - DDEthel Crudacre
I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer
Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett