If 2 adult males bought beer for 16 year olds and gave them Zanac are they liable for the teens' fatal car accident?

They have committed a criminal act as well as being civily liable. The criminal offense would take priority over any civil action. That does not mean a civil lawsuit cannot be filed. Athough nothing, obviously, can compensate for the lives lost.

Maybe, just as a restaurant could be held liable for serving intoxicated customers, who then go out and cause an accident. I dont agree with it, but even though a person should be held responsible for their own actions, and lives cannot be replaced, were the teens forced to drink, take drugs, and then drive a vehicle? Im sorry to any family who had to go through that.