Another consideration, within the context of 5e, is that both violence and mind control are things that all paladins have access to. Paladins are expected to fight, and have numerous violent spells, such as the various smites. All paladins also have access to mind control via Command and, at high levels, Geas.
Granted, paladins aren't always good-aligned in this edition, but one would expect that the designers wouldn't include a spell on the paladin's spell list that would cause a good-aligned character to become an oath breaker simply by virtue of casting it. Were mind control evil, the only oath in the PHB that could justify using it would be Vengeance (in which case they could have simply included those spells on the Vengeance paladin's bonus spells list).
Therefore, implicitly, it's seems clear that mind control (in D&D) is not intended as something inherently evil. Obviously, there are numerous evil applications for mind control that could cause a paladin to become an oath breaker, but it seems evident (IMO) that mind control isn't evil itself (within the context of 5e).