Modern vehicles are usually harder for car thieves to steal compared to older cars. Several factors add to this increased difficulty:

1. Innovative anti-theft features: Modern vehicles come equipped with advanced security features such as electronic immobilizers, transponder keys, and complex alarms. These features make it harder for criminals to hotwire or start a car without the proper key or authentication.

2. Keyless entry and ignition systems: Lots of modern cars now have keyless entry and ignition systems, which require a specific key fob to unlock and start the car. These systems use encryption and authentication protocols, making it harder for crimianls to bypass them.

3. GPS tracking and telematics: Some modern vehicles now come with GPS tracking and telematics systems that allow owners and the police to track down a stolen car very quickly. This can deter criminals and aid in the recovery of stolen cars.

4. Vehicle identification numbers (VINs): VINs are unique serial numbers allocated to each vehicle, and they are used for registration and tracking. The police can use VINs to identify stolen cars and recover them more easily.

5. Improved locking mechanisms: Modern cars have more robust locking systems and reinforced doors, making it harder for thieves to break into the vehicle.

6. Vehicle security systems: Many modern vehicles have integrated security systems that include features like motion sensors, glass break sensors, and alarms. These systems can deter thieves and alert nearby individuals or law enforcement to a theft attempt.

Whilst modern vehicles are generally more secure, it's important to note that determined and skilled thieves may still find ways to steal them. As a result, it's critical for car owners to take additional precautions, such as parking in well-lit areas, using steering locks, and being vigilant about their vehicle's security.

In summary, modern cars are generally harder for car thieves to steal due to the implementation of advanced security features and technology. However, vehicle owners should remain vigilant and take additional steps to protect their cars from theft.