If many men have protective instincts, why do some hurt women?

Anonymous
This is what I've been reading on some forums. They were bragging on how they would knock down a woman. These aggressive types seem to be on the rise nowadays.

And where is the so called ''Protective Instinct'?

Wouldn't this contradict itself? To me a man having a protective instinct would mean he cares about me and my healthy. Hurting me physically means and seeing me hurt as a result of what he did, would mean he doesn't care if I'm well and I'm hurt. I always felt safe with my then boyfriend. He would have never hurt me even if I were to hypothetically speaking (something I'll never do either) get in his face and scream at the top of my lungs. Certain men would probably have reacted (possibly throw a punch or something more) to that and thus that elimates their so called protective part.

Protective instint to me means that: caring I feel safe around him, not wanting to see me hurt and having self-control.
Updates
+1 y
For me being unfaithful and displaying aggressive towards me are my two main deal-breakers. If my then boyfriend had done either one of those two NO's, I wouldn't even accept him as a friend.
If many men have protective instincts, why do some hurt women?
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