First of all, Corp is the super evil in CP worlds
The game not show it well, but it's true that if there is a score of evil, corp will have 10000/100.
Because of they shape the world, every evil you seen in the game is corp's will.
They can make the world better, but them need it to be a shit.
The Origin Of Evil
If we keep talking this, we will go to politics about Karl Marx, the Alienation theory of How Capital make a human unhuman.
Do you know why the tech is high and life is low? Because human can't create value for capital anymore, capital use tech to create value and make the economy run between themselves, so that capital won't pay for people. This shit force people to consume eachother, which shown as "NC lose 30% population last year".
Remember the truth about joy toy, It's even a good job, because that is one of the rare field that people still have value.
Let's turn it back, Arasaka is the biggest corp of NC at Johnney's age, which make NC a freedom city at America, otherwise it should be the land of Militech.
So he hate Arasaka more is reasonable, and I believe he hate Militech either.