It is rational cause Apple can be sure that it does not willfully infringe on others patents and risks regarding those patents mines unavoidable can be managed

It is rational cause Apple can be sure that it does not willfully infringe on others patents and risks regarding those patents mines unavoidable can be managed through ad hoc negotiation and lawyers, lots of lawyers. Given such a high profile case just resulted in a puny $1B amount, with its over $100B war chest, Apple can take a few dozens of these lawsuits easily. Let's see who's willing to go against Apple and comes out ahead.