I have purple martins and tree swallows. They are both "good" birds, IMO. I house them in natural gourds.
I have seen the bees chasing the red winged blackbirds. It is funny to watch! But never had any concern or trouble with the Purple Martins or tree swallows.
Also two nests of barn swallows, no trouble from them with the bees.
The purple martins are totally dependent on man for their housing. They migrate from Brazil every spring. The Indians kept them and housed them in gourds. I figure it must have taken the martins thousands of years to lose the ability to live in natural tree cavities.
We know there were no honey bees in the area back then, since the bees arrived with the europeans. so even if the martins eat a few honey bees now and then (which I have not observed), I see no reason to fear them, and in fact from what I have observed the martins and swallows are quite beneficial. Primary Martin food is dragon flys and other flies, like mayflies.