Since this is part of the FRAND patent, Microsoft joined Apple in suing Google, and Apple went after an injunction for the Galaxy Tab and Galaxy Nexus over software patents...and sued Samsung...different.
There is no denying Apple has it out for google and samsung, but they have google in their crosshairs, and samsung is just collateral damage, they are after Android and will go about it any which way.
I wouldn't say they get away with murder, but they def have the upper hand in the legal field this week...which has been rare since the past year for them has been a downer in courts...