I did a little research for you and here's what I came up with. Plenty of others on BYC have had the same thoughts, shown in
this thread as well as
here.
Here's an extra from outside sources. Seems like to me the hens love them and they will provide nutrients for your hens. So, maybe it's more of a pro than a con! Also, they seem to be attracted to wet places, which makes a lot of sense considering all the rain we had today. If, for some reason, your hens aren't interested in eating them, methods of getting rid of earwigs can be found
here.