Well, I'm an alum (not of that chapter) and there's no way I'm defending their actions.
However I do have a few things to point out:
The only thing in the entire thread that suggests hazing is the "hell night" title and the blindfolds...other then that the rest of those pics are nothing that didn't happen at any band party I went to...there's nothing showing that they are forcing those girls to drink (and I bet there's not many on this board who never drank before they were 21, however, they didn't decide to post pics of it either)
Also, I don't believe that ASA has any national "drinking in letters" policy, but I do see that they are drinking in the house (unless they have their composits someplace else).
Is there a way to email the user? I'd like to send a nice freindly Alum to sister letter.