Subverted: The Protagonist packs a minigun for an assault on the Big Bad's fortress, but switches it to semi-automatic mode.
Double Subverted: ...he failed to realise that miniguns (and other gattling guns) don't have semi-automatic modes by definition and ends up reducing everything to rubble.
Parodied: The victim is killed by a massive barrage of teddy bears, soft pillows, comfy chairs and water balloons.
Zig Zagged: Having defeated Alice, Bob menaces her with a small army's worth of weapons. He ends up shooting her with a tiny gun instead... which ends up completely vaporizing Alice with an immense, spectacular explosion anyways. Turns out the unimpressive gun actually fires miniature nuclear warheads.
Averted: The amount of force used to kill someone is equal to the person itself.
Enforced: "The show will be more awesome if the characters do way more than necessary."
Lampshaded: "Isn't all this a bit much?"
Invoked: Bob brings a minigun when everyone else brings a pistol
Exploited: Alice first send her minions in to take care of Bob. After they're defeated, Alice ambushes Bob, knowing that he is left exhausted.
Discussed: "Why do we always have to be absolutely sure that every bad guy is dead?"
The heroes use so much ammo that they run out and are quickly killed.
Alternately, going all-out with the weaponry causes so much collateral damage that heroes fail their mission.
The heroes are considered insane for being so excessive and everyone else is wary around them.
The heroes bring more ammo to account for their increased use.
The heroes have an explicit license to do whatever it takes to complete the mission, collateral damage be damned.
The heroes fail to overkill one villain and their side pays greatly for it when he returns to wreak havoc. Now their allies understand that it may be grisly, but some things are better safe than sorry.