captain_spalding said:

In Texas, “Failure to Stop and Render Aid” is a criminal offense that occurs when a driver involved in a motor vehicle accident leaves the scene without stopping to provide assistance or information as required by law.

The penalties for Failure to Stop and Render Aid in Texas can be severe and vary depending on the circumstances. There is a minimum jail term of 120 days as a condition of probation, in the event that probation is granted for offenses punishable under the section of 550.021.

For Injury: Failure to stop and render aid in an accident-causing injury is generally a third-degree felony, punishable by 2 to 10 years in prison and a fine of up to $10,000.

For Death: If the accident results in death, the offense is a second-degree felony, punishable by 2 to 20 years in prison and a fine of up to $10,000.

How is not only failing to give assistance to people in peril of their lives, but blocking attempts by others to do so not a crime?

I have no idea. I think as a minimum it is manslaughter.