system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] How is punisher allowed to get away with murder?

Fine he kills bad people. But how is that allowed in a city where non murdering vigilantes like Spiderman exist?

Why is the govt allowing this and why doesnt it taint the image of the Avengers?
gpt
Frank is "allowed" to kill people because he's a criminal. He engages in violent vigilantism on his own merit and is officially a criminal in the eyes of the NYPD. *Spider-Man not murdering doesn't really impact this as he is considered a criminal as well, and the police would arrest both if given the chance. 

If the question is why Spider-Man hasn't caught him, there is the fact that Punisher is a prepper. He doesn't just go out shooting randomly except for the time he was drugged. He isn't going into areas where he would run into Spider-Man and if he does, he's already planned to use Spider-Man to help him complete his objective and then escape. The same can be said when he works with Daredevil, etc.

The government isn't allowing it (aside from when he was a member of the Thunderbolts), the simple fact is that Frank is very hard to catch. It isn't something the government can just do. He has been captured in the past and arrested, he always manages to escape. They could pour resources into trying to catch him but among all the things they have to worry about in a universe where a giant purple guy could eat the planet a guy in a skull shirt shooting mobsters is low on the priority list.

It wouldn't taint the image of the Avengers because they aren't affiliated with him. He's just some random Guy, there are literally thousands of costumed people in the 616 universe. It'd easy to distinguish them especially when the Avengers had a no kill rule for years.

That being said the Avengers have tried to bring Frank in at least two times. The fact that he ultimately got away again speaks to how elusive he can be. He's willing to do anything to get away such as when he stole the War Machine armor.