The concept of simultaneity and the ordering of events can indeed be relative in the context of special relativity. According to the theory of special relativity, the perception of simultaneity and the ordering of events can differ depending on the relative motion of observers and their frames of reference.
However, it is important to note that even though the perception of simultaneity can differ, the notion of causality is still preserved in special relativity. The principle of causality states that cause and effect relationships are preserved, meaning that a cause must always precede its effect. While the ordering of events can be different for different observers, the cause will always precede the effect in all frames of reference.
For example, let's consider two events A and B. If event A causes event B, the cause-effect relationship between them will still hold true regardless of the observer's reference frame. While different observers may perceive the events occurring at different times, all observers will agree that event A must precede event B in order for causality to be maintained.
So, even though the perception of time and simultaneity can be relative in special relativity, the fundamental principle of causality remains intact.