Mettle of Man rewards survivors for failure and punishes killers for succeeding.
Mettle of Man has now become the literal "new pre 2.6.0 Decisive Strike".
Survivors have a variety of second chance perks that all have counters or act as just rewards, however MoM is not one of those perks.
Borrowed Time can be countered by not camping.
Decisive Strike can be countered by not tunnelling.
Exhaustion Perks can be countered by attacking by striking while the survivor is exhausted.
Even Adrenaline (which rewards survivors for surviving most of a trial) can be countered by the perk NOED or an Insta-down abilities.
MoM can only be countered by Chainsaws, Evil Within III, and (maybe) Devour Hope or NOED. Or you could just not hit survivors.
So forgive me and so many others if we express frustration towards this perk. It's just baffling why the devs would make a perk that rewards failure and punishes killers for hitting a survivor.