Okay, there is no reason at all to jump on people like this only becouse they want LAN.
I can understand why they want it. Myself i do not need it at all, i find it useless.
But there is times where a LAN feature could be very good to have.
I know that sometimes when my friends LAN they do not always have internet connection, becouse it start to lag if all of them try to connect at the same time, so they just play LAN against each other, etc.
Not everyone have access to internet all the time, i know a few of my RL friends that only have connection when they are at their dads house. And becouse they go back and forth between mom and dad every week, it ends up with only having access to internet every second week.
And only becouse they do not have internet, they cant even play with someone sitting next to him/her, and that seems a bit odd, doesnt it.
So there is valid reasons to why people want lan, but there is also good reasons to why blizzard doesnt want to support lan.