I don’t think anyone will argue that signing Bellinger is good long-term. But, of the available free agents, Bellinger is likely the best bat we can add to the lineup next year. Best fit too. Lefty OF with pop, can cover CF and 1B.
Also important here is the fact that Atkins is in the hot seat. If the team fails again next year, he could be gone.
Signing Bellinger may be a necessary evil.