It's not about benefitting those teams. It's about punishing a team perceived to be cheating its way into a top 4 pick.
In a given year, the bottom 4 NBA teams are epically bad. It takes years of bad drafting, misevaluations, unfortunate breaks and a ton of losing for any team to find itself there. In other words, not teams that are one year removed from a runner-up finish. The Pacers were a pretty extreme case. If the rest of their roster stayed healthy, they're probably just outside the playoffs. The league was so convinced they were tanking, they actually told them to medicate Aaron Nesmith and encourage him to play. To outsiders, I'm sure it looked suspect.
The NBA doesn't want teams giving up if their best player goes down. NBA games are already a tough watch during the regular season.