As a naturalist and conservationist I don't see magpies as pests. They're predators that's all. And predators have young to feed as well.
Nature needs predators as otherwise we'll be overrun with blackbirds and robins. Nature sees to it that there's plenty of songbirds - that's why they breed in such numbers.
We may prefer songbirds to predators but who are we to judge?
In other words there's a balance. Almost always when the balance is upset the culprit is man - the biggest predator of all!
Quite agree but in the wild there is cover for the song birds and their nests. Unfortunately there isn't much "wild" left, just nice tidy gardens for the song birds to nest in which makes it easy for the magpies to find the nests. The tits are OK because they nest in the boxes, the robins do sometimes but blackbirds etc don't stand a chance so we need to "help" them. Someone wiser than myself once said, "if you save everything, you conserve nothing", very true. The magpie cull will continue, discretely of course.