Yep. And it's mostly about communicating. That they choose red for removals and green for insertions is meaningless. We may argue the same nonsense about stop lights. A parked car is safe a moving one can kill. So let's replace the stop lights colors. What? Yeah. Silly argument. The colors do not matter at all. Sometimes a cigar is just a cigar.

When programmers all around the world look at the red/green in a diff they understand it, without having to search for a legend explaining the colors.