Why Defensive Driving Course Certificate can't be used to get an auto insurance discount in Texas?

I passed this course in the middle of 2007 and got this certificate, but i can't use it as one of discount factors when i am gonna to buy an auto insurance. The licensed auto insurance agents told me that Defensive Driving Course Certificate can't be used to get more auto insurance discounts for Texas? Why? It's so weird. So, why Texans need to take that course besides for a court when i got a speeding ticket?

You can't use it to get a discount if you used it to dismiss a ticket. And maybe your company just doesn't offer that discount. Not all companies do, so shop around. Texans only need to take the class if they are ordered by a judge to not have a ticket go on their record.

I also find it strange that you are able to shop for rates online. Typically you can put in your information, but they cannot quote rates online for the state of Texas yet. It has to come from a representative of the company who is licensed.

Because Texas sucks and is the right wing arm pit of the earth.