Because all software patents shouldn't be granted?
Because you have studied them deeply, fully understand their claims and believe there is prior art or no inventive step (the current requirement for the inventive step seem very low, do you think that this is not being met or you believe the standard should be higher)?
The patents have now withstood not only the flawed patent office examination but have been tested in court. The presumption should now be that they are valid and not bogus unless you provide justification or at least explanation of your view.
Samsung/Google should also presume validity and develop a workaround while the case is pending to strengthen their negotiating position and remove risk of a ban. This doesn't mean that they have to stop fighting legally.
Edit: A reply suggests I may have been wrong to believe that these are the patents that were tested in court. If I was wrong the advice would probably be to plan potential workarounds but not carry them out.