You alliance member may need a better base design with the silo.
If this silo continues to stay in place, it will get worse. The effective base designs will catch on. As someone who is into defense design, I know this thing is lethal and the whole base should be designed around it. The only other building like that is the Bazooka Tower/Sentry.
What other building can basically 1 shot your entire army with a range of the whole base? Nexon, seriously, were you drunk? Please ask the players first before you implement major changes like this. I am begging. Please. And, don't just ask, read their responses, then think about it and deliberate. No one wants to drive this game into the ground.