The support aspect isn't about blame. As a corporate customer, I want to know that if I build my operation to depend on a third party product (ERP, etc) that somebody will be there to help in the event that it becomes problematic. In many cases, buying support coverage is much cheaper than having product experts on staff to address unusual but costly issues.

A product that comes with support necessarily implies that when something goes wrong, the product can be blamed and the vendor can be leaned on for "support" to fix it. So while the support aspect itself may not be about blame it is bundled into that line of thought.