There can be several reasons why people tailgate even if you're already driving over the speed limit. Here are a few possibilities:
Impatience: Some drivers may be in a hurry or have a sense of urgency, and they want to reach their destination as quickly as possible. They might feel that you're not driving fast enough, despite being over the speed limit.
Different perceptions of speed: People have varying perceptions of what constitutes a safe or appropriate speed for a given road. While you might consider your speed to be reasonable, others might have a different perspective and believe that you should be driving even faster.
Aggressive driving behavior: Tailgating can be a form of aggressive driving, where drivers attempt to intimidate or pressure others to drive faster or move out of their way. It's important to note that aggressive driving is unsafe and can lead to accidents.
Lack of awareness: Some drivers may not be fully aware of their own driving behavior or the potential risks associated with tailgating. They might not realize that they are following too closely and endangering both themselves and the driver in front.
It's crucial to prioritize your own safety while on the road. If you encounter a tailgater, it's generally recommended to maintain a consistent speed, signal early when changing lanes, and consider pulling over safely to allow the tailgater to pass if it is safe to do so.