The God of Mischief goes through drastic changes in Marvel's Loki's (Tom Hiddleston) entire character arc in the Marvel Cinematic Universe. In the film, Loki learns he's not an Asgardian. Instead, he's the son of Laufey, the leader of the Frost Giants, and Odin (Anthony Hopkins) took him in as a baby. Frost Giants are the enemy of Asgard, and the revelation tears Loki apart. He becomes desperate to prove he's worthy of the Asgardian throne, taking his anger out on his former home of Jotunheim.
The God of Mischief changes after being arrested by the Time Variance Authority in Loki. Initially, Loki gets up to his old tricks, scheming to take over the agency. However, throughout the first season of the series, Loki recognizes his villainy and discovers he can forge his own path. In the Loki finale, Miss Minutes (Tara Strong) even offers Loki the chance to beat the Avengers in New York and rule over Asgard. However, he rejects the deal, showing his motivations and his glorious purpose are now entirely different.
Despite Loki's personal growth, he still needs to answer for one of his worst crimes. In Thor, Odin falls into Odinsleep after being confronted by Loki about his parentage. The God of Mischief then tricks Laufey into thinking he can murder Odin, but he betrays and kills the Frost Giant leader at the last second. Loki then decides to commit genocide against the Frost Giants and uses the power of the Bifrost Bridge to attack Jotunheim. Thor (Chris Hemsworth) eventually stops him, destroying the Bifrost Bridge and saving what's left of the Frost Giant race. However, before Loki's plan is thwarted, he still brings untold devastation to the Frost Giants' planet. Therefore, Loki season 2 needs to address Loki's attack on Jotunheim.
Loki's crime against the Frost Giants doesn't deserve to be an afterthought. In Loki season 1, Mobius (Owen Wilson) gives Loki a look back on his "greatest hits," including his attack on New York. However, the God of Mischief's attack on Jotunheim is even more egregious. He murdered Laufey, leaving the Frost Giants leaderless, and he completely decimated their planet. The Frost Giants don't deserve destruction just because they are Asgardian enemies. Loki season 1 shows the God of Mischief is strongly tied to his past, so season 2 has the opportunity to address what's arguably his worst crime.
Though Loki's attack on Jotunheim was devastating, it was also part of his path on the Sacred Timeline. Before the TVA's leader, He Who Remains (Jonathan Majors), is killed in the Loki finale, the organization strictly governs the Sacred Timeline, ensuring everyone stays on their assigned path. Since the destruction of Jotunheim was always part of Loki's story, he had to attack the planet no matter what. Still, that's not an excuse for the God of Mischief's biggest crime, and Loki season 2 should recognize that.