The idea was to kill grief, blocks are there to stop them getting out akin to a nuclear reactor explosion afterwards.
a
I didn't know we were being considerate
I'd feel bad for someone who spent hours on breaking one block just to get into my base
(of course, there's the side of me that would troll them by putting another layer of blocks before they break them, then eventually make a layer with lava and when they turn to run, they'll realize that I removed all the land around them with warded blocks, and proceeded to steal all their items with MFFS.