The slo-mo videos of the race certainly make it look like Robles was trying to grab Lui's hand 3 times and caught it twice. His arm motion certainly looks like an intent to grab and I came to this board as outraged as anyone. Then I saw this site and video:
http://hurdler49.wordpress.com/2010/12/29/dayron-robles-in-slo-mo/
This shows that the Robles arm motion is his normal form. The author comments (in 2010):
| What I don’t like about Robles’ form is his flailing trail arm.
So now intent is not so obvious to me. It's possible Robles intentionally veered into Liu's lane. Also note that in the picture everyone keeps showing:
http://a57.foxnews.com/static/managed/img/Sports/396/223/robles640.jpg
that David Oliver (on the right) has his arm clearly in Robles' lane. Since it didn't cause obstruction it's not an issue.
After going though this, I think:
1. Robles clearly deserved to be disqualified under any reasonable interpretation of the obstruction rule.
2. While intent may look obvious in the slo motion video, this appears to be Robles' normal form.
3. I would respect Robles (much) more if he expressed his disappointment differently, i.e. without crying victim and with more respect for his competitors.