Don't the Bobby & Co have ethical boundaries?

One of the things that amazes/annoys me when watching this show is how they portray that it's ok to do whatever they want as DA in the name of defending their clients.

They pull off ridiculous actions like their Plan B. And then they are like "no hard feelings. We were defending our client." Even DA have ethical and moral obligations in their actions no? It is not like they can pull everything they want and still be considered ethical.

How many times did they backstab Helen who Bobby once dated and Lindsey (and later Eleanor) was room mates/friends with. Everytime they need a favor, they use that friendship but when they are desperate to win, they stab her in the back. But in the next episode Helen is sitting with them revealing her case details which she knows will come back and bite her in the ass again. It's not a possibility. It has happened already.

Helen feels moral obligation to take actions against her side even when legally she doesn't have to but Bobby or his team never does that.

Only two people I feel morally and ethically behaving were Rebecca and Jimmy. Everyone else lost their morale conscience and then we are supposed to sympathize for them?

If a serial killer comes to them for defense, they will pull all their tricks to free him. But if the same serial killer attacks them, they want action to be taken even when there's no legal reasons to.

These people used to care about their morale dilemmas. But Season 3 onwards, I don't see that coming up as a problem for them. They just want a win at all cost.

Then they talk about fairness and unethical behavior by the DA for trying to convict their clients. I find that laughable.

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