Then Harry had taken the stand. The courtroom was in awe as he testified on behalf of a known Death Eater. Many did not appreciate it, as the war had hurt everyone. But he spoke for nearly an hour, about choices... fear and options... and put the question to the Wizengamot. What would they have done? At 16? With Voldemort living at your home? With Death Eaters surrounding you and your family? That shut up the hate-mongers, and Draco just stared at him, almost slack-jawed in disbelief.
Harry dragged out everything he could about how Draco refused to kill Dumbledore, that Voldemort was threatening him, and crucially, that Draco had saved him at Malfoy Manor. Harry even suggested that Draco "gave" him his hawthorn wand when they escaped. Harry even raised it up to the court and declared he would not have been able to defeat Voldemort, if it weren't for that wand. The wand that was currently hidden in the depths of Draco's robes.
It was a wash, though, in the end. The Wizengamot cleared him of the life-sentence crimes but convicted Draco for three: the accidental poisoning of Ron, the almost fatal cursing of Katie Bell and the attempted murder of Dumbledore. They gave Draco reduced sentences for them as well. Harry had felt somewhat relieved that his old nemesis wasn't sent up for life and, if he had to guess, Draco had looked relieved, too. Their eyes met as the court security wizards approached. Draco gave a single nod, Harry assumed in thanks, before they led him away.
As Draco shuffled toward the end of the bars, Harry still wondered if he could have done more. Appealed it? Asked Kingsley for a favor? He didn't do anything. He walked out of that courtroom six years ago, convinced he had done all he could and the matter was settled. Draco would have to do a few years, and Harry even had a notion that he would talk to him when he got out. He had spotted the hawthorn wand in his sock drawer occasionally after that, but only a year after Draco's trial, he had been captured and tortured by that sadist. Nothing else really mattered after that.
Harry was ashamed of his response to his own assault. He had lied, cut everyone off and descended into full-blown alcoholism relatively quickly. Joel told him that he shouldn't feel guilty for responding like that. He said that it was PTSD, and Harry was trying to cope with something he had no idea how to handle. Harry couldn't deny that, but it didn't make him feel any better. He only thought about himself... even when he glanced at Draco's wand over the years. 
When he realized it was Draco's birthday, he wrote Blaise about his party idea. Joel thought Draco was ready for guests, too. Harry hadn't asked him about the wand, though. Maybe he should have, but he knew it was something Draco needed to have. He kicked himself for doing it in front of everyone like that, but he also understood Draco's response to it. Both the inability to cast and the dire need to have protection. Harry was imprisoned for three days without his magic, and just a short time ago, he couldn't bear even a second in that magic-free room. Draco... he went through six years of it. It was bound to affect him.
Harry remembered constantly checking for his wand after his attack. He kept it at the ready for months after in constant paranoia. So yeah, he understood Draco's knee-jerk reaction to his suggestion of taking it back and hiding it. After Harry started at St. Mungo's, he noticed he didn't need his wand anymore. He could Summon, Vanish, enlarge or shrink things with his magic alone. He experimented more and could cast any spell he tried. He still kept his wand on him, though.
It was a security blanket for a long time, and he didn't want to let something that he had relied on so much go. He even had rationalized his thought process. He told himself he needed it to duel, as it'd be faster, and not using it would alarm people. His Auror trainers had beat into him that he should never be unarmed. But eventually, he realized that it was a hindrance. He cast better, faster and more accurately wandlessly. His ability to heal by touch was... unique. No one could do it like he could, and he loved making people feel better. It took a couple of years, but he stopped carrying. He trusted his ability to defend himself, and Draco would eventually trust in himself, too.