Probably because it mostly contains rehashed opinion and conjecture and almost nothing of substance.
I don't know why people would bother flagging something like this though, threads as content-less generally die on their own without much fanfare. OP and his friends get an ego boost from making front page and then it fades. NBD, no need to be contentious about it.
This thread was previously [flagged] [dead], but is now back to normal. I assume via moderator action?