It's not up to you to decide from whom you're allowed to steal content. You can't steal money from Bill Gates's wallet just because "you don't think he's starving," even if you plan to give that money to a needy charity.
How about "circumventing" the ticket window at your local movie theater by walking in the exit door. I mean, they are showing the movie anyway, and there are empty seats...
So using 3rd-party website to access their content is not any different that accessing the site through Facebook redirect for instance since in both cases you get content for free.