The harm side comes in multiple forms:

Harm to the animals; by removing their nutrient dense food source, and feeding them sugar water in its place, impacting colony health

Harm to the ecosystem; by mass producing honey bees we are choking out other pollinators, and the selective breeding for honey bees prioritizes output and makes colonies more susceptible to disease and collapse.

Even if you feel like the bees we're farming lead a good life, that life comes at a cost of other species - we are choosing a winner in the food web in a way that could be done less harmful for similar end result (i.e., plant sugars / syrups). Much of veganism is about harm reduction.

Knowing the importance of pollinators to our food supply, as a vegan I would probably not have much of an issue with pollinator farming if there goal was maintaining biodiversity, instead of min-maxing profit.

This is a false equivalence; the answer is “neither”.

Veganism doesn’t seek to end all animal suffering, but not to exploit animals for humans’ sake. We don’t need animal products to survive, so we shouldn’t add to whatever misery already exists naturally.

In the case of livestock, we should just stop breeding them. No vegan is arguing for dumping all cattle in the savannah to be hunted by lions.

This guy would own slaves

This is pure bullshit. Pigs, cows, chickens all if left to their devices form societies, display complex emotions, and have just as unique of personalities as humans do.

Humans don't even permit most of those animals to live past "teenage" years. Its not decent treatment, I recommend the documentary Pignorant if you want to see first hand what a gas chamber is like.