And it is true that most car makers develop the suspension set-up in road cars to pull slightly to the left (in right-hand drive cars) for safety reasons.

Why is my car pulling to the left after an alignment?

The most common reason a car pulls to one side is that the wheel alignment is off. Whether it skews to the side over time, or you hit a particular vicious pothole, wheel alignment will be altered by driving conditions, and it should be checked regularly.