My gf is a bit of a Harry Potter fan (why do I feel the need to justify this? Whatever) so when watching the movies over her shoulder I usually pick up more than a few gripes.
1. Apparently truth serum is a real thing, and apparently it's easy enough to put together that the potions teacher at a high school has access to it. And is it used in trials? Including trials trying to determine whether or not people were compelled by evil magic to do the dark lord's bidding, and there's apparently no way to tell who was compelled and who wasn't? Does anybody mention it when they're trying to work out how things went wrong? Does it ever come up in ANY context other than threatening Harry Bloody Potter? Of course not.
2. After Harry uses magic to defend Dudley from the Death Eater and he's put on trial (without the use of truth serum OF COURSE), and Dumbledore suggests justifying his actions with self-defense, the Minister for Magic (the Minister presiding over a CRIMINIAL trial no less) suggests that the law could be removed. In front of the entire frigging court, FILLED with officials he proposes to remove the legal right to self-defense specifically to convict one child. And who mentions it? Nobody. Apparently this is perfectly alright behaviour (yeah, I get that the Ministry is SUPPOSED to be corrupt, but come on, they're not even trying to hide it).
3. In the Goblet of Fire, after not putting his name in the goblet, Harry is apparently expected to compete because he has been joined by a "binding magical contract". A binding contract on a 14 year old -yep, sure (alright, fine, magic, moving on), but more importantly, this is a competition that was originally stopped because too many people frigging DIED. Leaving aside what could possibly possess them to start the bloody thing up again, what could the penalty be for breaking a magical contract (that he never entered into) that it's worse than competing?
4. Order of the Phoenix. How many times have the order individually beaten Voldemort? None. How many times have they, personally, gone up against Him? None. How many times has Harry beaten Him? 6 or 7. How many times has he gone up against Him? When he was 1 year old, plus every single year since he started high school. So what does the Order conclude? Obviously Harry can't be involved, he's too young. Should we tell him what's going on? Of course not! Why, if we keep him totally in the dark, his ignorance is SURE to keep him safe from the arrogant, psychotic snake-person whom he has defeated at LEAST 7 times over the course of his life! He may have made attempts on Harry's life every year for the last 6 or 7 years, but I'm sure that THIS is the year he'll be left alone. Dumbledore is also guilty of this. Harry talks to Sirius about he feels angry all the time. My opinion? That's a completely reasonable reaction considering you're surrounded by MORONS.
*deep breath* Rant over. Peace.