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Or more like because it's a hax than a physical force stuff. You see, most of protective enchantments are fidelius, disilusionment charm, intruder charm, anti apparition jinx, dark mark repelling spell(which bill modified and the death eaters has their dark marked people only barrier spell) that hides the location and it's visibility and automatic warning strangers, teleporation negation etc besides physical shields spells like protego. So when they get ride of all the other protection spells that conceal and alert them from attacks, they could just break through the physical shield that can be took down by firepower.I stand corrected, I see. The only thing I'll argue here, is that they're speaking of "undoing" the protection charms, which in my opinion could mean that they are unable to force their way through with offensive spells. It's also worth noting that it's implied in your last quote that there were multiple enchantments stacking around Hogwarts too.