Why in Nascar races are drivers intentionally wrecking each other?

Answer 1

Usually in a Nascar race, a driver that attempts to wreck another driver on purpose is doing it for payback. The driver who got spun out or rear ended, probably did something in that race or in a previous race to the driver who just wrecked him. It might not be the smart or correct thing to do, but it is almost like an unwritten rule. That is why drivers are usually put on probation by Nascar and not suspended. A suspension will be handed down to that driver if this continues while on probation.