@bkmtech,
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It looks like it is a moot argument. It seems VistaPrint has addressed complaints about it, or it wouldn't be removed from the immunizations.
Reply to #1. I don't need help for myself, but I have a couple of friends that I have to disinfect their computers fairly regularly. In order to 'see' something, they click thru warnings that the security programs give them. I can assure you that they have 'seen' almost everything.
Reply to #2. Their reputation preceeds them. I don't visit the site, so have no first hand information.
Reply to #3. ewebsky told you how. A web owner is and should be held responsible for any affiliate the has been allowed to place a link on their site.(and especially if allowed to run active content from a 3rd party site)