Frank Castle is not a nice dude. While most superheroes have the ability to navigate grey areas with expert precision, Castle just sees black and white.
His work ethic boils down to; if you're good, you're fine but if you're bad, you die. Well, it's not like you can call yourself The Punisher and just let people off with a slap on the wrist.
The anti-hero has stacked up a kill count that would make Loki look like a schoolteacher. He often comes to blows with other heroes due to his methods, but despite their constant objection he does not back down.
Castle's simple views on problem solving could be described as effective, criminals can't cause any more trouble if they're suffering from a bullet to the head. However, it does come with its fair share of issues.
Looking at the world through The Punisher's eyes can lead to incidents that most people would consider an overreaction. Sure, a Frost Giant eating someone's family, bringing up horrific memories of your own family's death, might be considered a prime candidate for execution.
However, not all of the vigilante's kills are quite warranted.
Frank went through a pretty bad phase during the Seventies. As if trying to kill Spider-Man on his first outing wasn't enough, The Punisher came back to cause trouble during Peter Parker, The Spectacular Spider-Man.
Issue #82 opens up with a typical monologue as we follow Castle across the city. Yet even for this murder hungry anti-villain, what he does next is extreme. While on patrol, he comes across an incidence of domestic violence and intervenes by shooting the husband through their window.
He leaves without killing the man, which is already out of character for him, but his next target is even stranger.
A couple are walking out in the rain, holding newspaper over their heads to stay dry. When the newspaper becomes saturated, they put the it in the trash can, but miss the opening. As the couple walk away, with the paper on the floor next to the bin, The Punisher rears his head.
Declaring littering a "crime against society", Frank opens fire on the unsuspecting couple. His reasoning is that smaller crimes can lead to bigger crimes, but missing a bin is hardly worth a death sentence, is it Frank?