Why can't you use the LWCMS in home base?

A sniper can sit in their home base and shoot players and can't be killed unless they are shot. You can't flank them, even if you try you are killed due to being out of the battle. A player using the LWCMS has to be on the battlefield zone to use it. I think the snipers shouldn't be able to hide in their home base. If they can then a player using the LWCMS should be able to too. How is that fair play? EA think before you create, not that hard.