Why Do You Need Clock Synchronization?

If your clocks aren't synchronized, it's very hard to kind of understand things that might have happened on system B and how they relate to system A. And I suppose there are also some distributed systems, algorithmic reasons to want clocks. But don't people in other industries care a lot about clock synchronization too? You know, just like a generalsys admin-y topic,. Maybe it's because you're concerned about intruders or maybe it'sbecause you're just trying to understand the way things are functioning.