> Well, as any form of full or partial freedom-restriction works both ways, the thinking is that social groups with less power deserve more protection. Obviously, no one like to be marginalized in any way -- even the more powerful members of society -- but if someone must be hurt, we prefer it to be a group that will suffer less real damage.
Bit of a tangent, but if you deliberately wanted to create furious opposition to your policies there's no better way than to put unequal protection front and center. "Everybody should be protected from X" is a winning policy. "These strangers over here should be protected from X, but not you" is, to put it charitably, not.