Outside of sneak damage (which in longer combats/higher difficulties is micromanaging hell in combat) every other class except cleric* consistently out-damages rogues. You can kinda make up the difference with the dual hand crossbow/Thief subclass cheese, but only until level 6 where every other class (except cleric*) awakens and can consistently do more damage per round after the first round. If you never get into combat, like your example, rogues can be powerful, but realistically a barbarian with half the levels will have better action economy and damage per turn the second combat starts.
*This isn't to say clerics can't be powerhouses, but the best/consistent damage output for clerics isn't online until level 8+(war domain multi with either paladin or fighter, or monk if you want to be extra spicy), at which point your cleric really should be focused on healing/buffing and not doing practically any damage themselves.
Everything is harmful though, that's the problem of existence. Nicotine is a psychoactive drug that does have both positive and negative effects. Vaping is safer than almost every other delivery method, and it's the safest recreational delivery method available. There's more than enough education on why nicotine is bad, which is the most you can really do.
People still drink, despite the physical addiction risks, the massive health risks of even a single drink a week, and the fact drinking any amount puts you almost comically more at risk of physical injury than not drinking. The education is fully out there. People still do it.
Free will is a hell of a thing, and restricting it has never ended well for those that restrict it, regardless of reason.