Was Arthur justified for his killings?(Joker movie spoilers)

Reasons for Arthur Fleck's killings : 

Those three Wayne enterprises businessmen : Killed for beating a seemingly harmless guy for no good reason.

Penny Fleck : Killed for allowing her boyfriend to abuse her son. Root cause of all the troubles in Arthur's life.

Randall : For giving Arthur a gun but not owning upto it when he got fired just to save his @ss.

Murray Franklin : Killed for humiliating an "innocent" guy in front of the whole world just for his show.

Are the reasons justificable for his killings?

No. The movie is  based on one of the craziest villains ever, u shouldnt even look for justification 

Originally posted by: 2RsFan

No. The movie is  based on one of the craziest villains ever, u shouldnt even look for justification 

But he was the hero of this story.

Originally posted by: Looney86

But he was the hero of this story.

he was the protagonist of the story... Not the hero. 

Originally posted by: Bluehue

he was the protagonist of the story... Not the hero. 

Hero or protagonist, I don't care. My question is was he justified for his killings?

Originally posted by: Looney86

Hero or protagonist, I don't care. My question is was he justified for his killings?

nope and neither movie is trying to justify the killings.  It just states that how we as society sucks