It makes perfect sense. You have a narcissistic asshole in the White House who got elected because the Democratic Party fumbled the ball.
but for some reason a whole heap of people decided to stay home this time and this is the result, hope they still feel happy with their decision
It don't want to sound too persnickety, but there is always at least one losing side in an election. It doesn't have to mean they dropped the ball, it could just mean people preferred the other option. Hindsight bias is wonderful, but you have no idea what would have happened if they'd run with a different agenda, they may have had a worse result.
The 2024 election had historically-low support from normally stalwart Democrat demographics such as Latinos, the youth vote, and black males. That, IMO, supports the conclusion that the Democrats did something wrong this time. Also, not only did those groups abstain but Trump also picked up quite a few votes from them (especially working-age black males), suggesting that they are swing voters who probably could have been swayed to stay on the Dem plantation if exposed to more convincing messaging, or a more compelling Democrat candidate.