I doubt that, otherwise you could argue that Kinko's would be at fault when people pay to make photocopies of copyrighted content in their stores.

Kinkos was in fact successfully sued for just this thing. Example: http://www.bc.edu/bc_org/avp/cas/comm/free_speech/basicbooks...

You're saying Kinkos was acting as a dumb copy service and was sued for copy right infringement. But your linked case explicitly says this is wrong. Rather, they lost because:

    Kinko's has periodically asserted that it acted at the instruction of the
    educational institution, that is, as the agent of the colleges and is without
    responsibility. Yet, Kinko's promotional materials belie this contention
    particularly because Kinko's takes responsibility for obtaining copyright
    permission while touting the expertise of its copyright permissions staff (a
    "service [which] is provided at no charge to all Kinko's customers.").
    "Copyright Information Letter to Faculty Members," in Kinko's Copyright and
    Professor Publishing Handbook, at 40.

...and because of this, they have refused to make copies of documents that I have written myself. Not sure if the policies have become more nuanced in recent years, but more than once I had to remove the (c) in the footer of my documents before they would make copies of it for me, no matter how much ID I showed them. I understand why the clerks would be trained that way; was just a very strange side-effect. Felt like living in a minor Kafka piece.