What is something that really makes almost no sense, no matter how you look at it, in the Harry Potter story?
There are more than just a few things in contention for the title of, "Makes the Least Sense" in the Harry Potter story. Here are a few. Specifically, these are things that, on the surface and at first take, might seem to make sense, but begin to fall apart upon further scrutiny.
Let's take a look:
Leaving Harry with the Dursleys, even after learning of the abuse
Albus Dumbledore tells Professor McGonagall they need to leave Harry with Vernon and Petunia so the fame won't go to Harry's head, but it doesn't make sense that once Arabella Figg reports to Professor Dumbledore how the Dursleys were actually treating Harry that he allowed the abuse to continue.
Put Harry with someone who won't let him grow a bloated ego? Okay, sure. But, that still doesn't translate to justified abuse.
Later, Albus mentions he left Harry with the Dursleys to keep the Evans family protection intact, which is fine, but that's not a legitimate answer to, "Why did you let the Dursleys treat Harry so poorly, Albus?"
He had Arabella Figg reporting to him regularly, so Dumbledore knew what was going on in the Dursley home.
All he had to do was send a Howler to Petunia telling her, she and Vernon needed to take their foot off the asshole pedal. Instead, he allows it to continue, taking the Dursleys to task only at the start of Harry's sixth year at Hogwarts, as a means of deflecting his own culpability.
Really, Dumbledore's logic, this idea that Harry needed to be treated poorly in order to teach him how to be self-sacrificing is patently absurd.
Even Jesus Christ had parents and siblings who loved him as a child.
Sending Sirius Black to Azkaban without a trial
The basics are well-known; Sirius went looking after Peter Pettigrew after the events at Godric's Hollow. Cornered, Wormtail blew up twelve muggles and cut off his own finger to make it look like Sirius had done all the damage.
Then, Barty Crouch, Sr. snaps Sirius up and sends Sirius to Azkaban without due process.
Now, the archaic judicial system of the wizarding world isn't the issue. At any give time, Crouch, Fudge, Scrimgeour, and Pius Thicknesse, all hand down laws without legislative approval, and that seems to be both the acceptable and the norm.
What doesn't make sense is that Barty, Sr. wouldn't want to go through procedures for his own political agenda. Because Crouch was angling to become the next Minister of Magic. And taking down all of Voldemort's Death Eaters was a very public way to gain popularity.
So not putting Sirius on trial made no sense, forget about proper legislative procedures.
Crouch should have paraded the madman who admitted his guilt (or refused to claim innocence, really) in front of the Wizengamot just to get his name in the Daily Prophet and build the political currency he needed to become Minister for Magic.
Remus Lupin not telling Professor Dumbledore that Sirius was an Animagus.
Remus was supposedly ashamed of himself for hiding what he had done as a student at Hogwarts, breaking Professor Dumbledore's trust in him by running around as a werewolf with James, Sirius, and Peter, once a month, for three years.
Okay. Remus felt ashamed; guilt he carried for over a decade. Eventually, he loses his friends to Voldemort and the Second Wizarding War, becomes depressed, barely hanging on to his sanity, hardly able to make ends meet.
Then, one day, Dumbledore comes to him and does pretty much the same thing he did twenty years earlier - gives Remus a chance and a purpose to return to Hogwarts. Of which Remus is obviously grateful.
Remus then comes to Hogwarts, where he meets Harry Potter, and comes to love Harry, as much as he loved James. There's clearly a deep emotional attachment, and desire to protect this son of his dead best friend, (presumably) at all costs.
What makes the least sense in the Harry Potter series?