This principle works with this problem too. Abusive items/mods are completely fine, they give an admin or host a sort of establishment over server go-ers.
They don't need a command to mix clearallbricks with instant death to every player to hold a position of power. They can force a player off a server and prevent them from coming back, and people abuse that enough already.
If you don't enjoy being abused, then don't go to that server.
People probably won't name their server "com here 2 get killed by tronadeo." You have to waste time digging through the ones that suck if you're out to find something new.
And you never know, maybe the host isn't abusive, like most of the intelligent people on this forum, and won't abuse a mod that might just be enjoyable.
It certainly won't "just be enjoyable." The tornado flings people to the sky, the storm doesn't do anything besides killing or damaging players, and armageddon kills everyone. It will be abused to slaughter the masses.