Babel - let us build near enemy towers

So I was playing on babel and dug a tunnel to the enemy’s base. But when I was near their base I accidentally broke a block which exposed me to the enemies. So I went to quickly place a block - only I can’t for no discernible reason and am killed a couple seconds later.

So what I want to know is this: Why can’t we build near enemy’s spawns? We can’t cheat or grief by doing so, since we can’t help them build it as we’d be killed, and how would we grief it by placing blocks, especially since griefing is part of the game???

So please, let us build near enemy spawns/bases/towers/whatever. I don’t see any downside to it.

It [i]would[i] be nice to be able to build near the enemie’s spawn.

IMO that makes tearing down the enemy tower way too easy. How, I’m not even going to explain.