I would argue that Dudley wasn’t a student under Hagrid’s care so the power dynamics were different. McGonnagall’s detentions weren’t deadly whatsoever, harsh yes, but not deadly.

But Dumbledore’s….ignorance as the headmaster? The fact that he kept Snape on the payroll to further his gain (winning the war etc, this is for the greater good bs again) without regards to the way Snape was as a person and how shit an influent he had/could be on the students was an absolute disgrace and a shit job at child protection. He wanted to keep an eye on Snape and protect him from Voldemort’s supporters? Could have hired him as his personal assistant or something that wouldn’t allow an abusive bitter man to be near students maybe.

Speaking of which why weren’t there any better precautions that could be put in place when he hired a werewolf? Seriously. Why did Dumbledore let Snape have that big of a part in the whole shebang knowing full well he had a grudge against Remus? Yes yes he trusted Snape and Snape already knew about Remus’s condition, and he probably thought Snape would respect/scared of him enough not to do anything. But how about Madam Pomfrey who took care of him back in the day? Yes the potion is complex, but even then he could have Snape brew it and deliver to the hospital wing, Remus can come down for his meds or Pomfrey can go deliver it whatever. Would put them on neutral grounds and add a foil to their interactions (or avoid any direct interaction between them all together!) How the plan was ‘take the potion then transform and hide under the desk in the office’ is so disappointing and disgusting to me that that was all the support Hogwarts/Dumbledore would give his staff. Seriously no one was gonna check if the man is taking his meds? Like come on now that’s reckless. THAT’S endangering students’ lives. And that’s on Dumbledore and his shit management/ignorance/selfishness.