No? At least Getty Images does [1]. You can try and sue your website company for damages, but that's another story. The copyright owner will sue you since you're using the images without permission.
[1] sorry, german: http://www.ferner-alsdorf.de/2013/04/urheberrecht-gettyimage...
How do you know they aren't? It might be very easy for someone who's not technically knowledgeable to plug in a wifi router without configuring it, leaving their Internet connection open.
Can I also plead "legitimate ignorance"?
Sweet.
No, the poster above had it right. It's not the specific remedies that're needed, it's them throwing open the door the way they would want if they were investigating.
Sure, this may be a mistake, but if it's an important issue as they make it out to be, they shouldn't brush it off.
Yes, you should. If you were sold that, and it's not licensed, it's the companies fault. That can be easily be shown in court.
Yes, although this is not exactly the case.
It's not like they are getting people to court for cases like this -- which could be legitimate ignorance.
They do it for people downloading and sharing copyrighted content knowingly. Now, if somebody else was using their wifi, that's another thing (and it can be shown in court).
But they don't really do it for cases that are analogous to "i trusted a website company and they used pirated stock photos".