Only a Sith deals in absolutes. If telling Jimmy about the tape were his first offense, yeah, I would consider it immoral to fire him for it. You'd have to convince me that taking away a man's livelihood for an offense that small merited that reaction. There's a case to be made that it puts him in serious doubt, but one-and-done is too big.
The "offense that small" in question is helping covering up an actual felony here. So...felony. Is that an offense large enough to merit an out on the first strike?
I think referring to it as deliberate sabotage is an issue. More like "not helping a guy screw over his brother, after that brother screwed over the first brother, who himself had screwed over the second brother before that." Ernie wasn't testifying in a court of law when he lied to Chuck. He's not obligated to help Chuck make a case against Jimmy.
No, it's deliberate sabotage. Possibly not whatever constitutes legal sabotage (I have no idea, I'm not a lawyer), but Ernie is actively planting false information to undermine Chuck's case against him.
The reason Ernie was called into the hospital room was to witness Jimmy's admission to guilt when Chuck cornered him into an argument he couldn't escape. Now, if that happened, and then Ernie simply refused to testify against his friend, then yeah, that would be simply not helping. But planting false information to undermine Chuck's investigation is something different.
The issue is that Chuck is using his moral code as a cover for a personal vendetta. That's especially reprehensible to people who *do* live by a moral code.
I don't agree. My interpretation of Chuck is that he is genuinely persuing his moral code, while also having a personal vendetta. It's not a cover, the way oil sits atop water. It's more of a homogenized mix of motivations. They're so closely intertwined you can't truly seperate the two because, if we were to hypothetically entertain the idea that Chuck feels no personal vendetta to Jimmy and is truly just acting in his duty as an officer of the law, it's very possible he'd be doing the exact same thing he's doing now: Making sure Jimmy faces consequences for his actions.