4chan's mistake was making the raid public, Tumblr's mistake was existing on the internet.
I'm not really a fan of websites that use the "Flickr" naming convention to seem more Web 2.0, it just shows lack of creativity if you ask me. And the tumblr users stealing content from other websites just shows the site is filled with equally uncreative people.
2 days ago Tumblr brought 4chan down for 30 minutes, they spammed: "WHAT IS AIR-HERPADERPA"
Then 4chan brung them down for a day, they spammed young 18 year old pr0nz all over the site.