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A higher pressure tyres give you a much smaller contact point, so all (hypothetically) 100kg of you and the bicycle are in this tiny contact point that does not provide much "give" at 100psi.
The main reason why people ride at this pressure, is because it feel faster.
This mean that when you run over a debris, it have a much higher chance of getting embedded.
A lower pressure tyres provided not only provide a wider contact point for all 100kg of you, but it have a lots more give to prevent the debris from getting embedded in the first place, providing that you drop the pressure accordingly.
Think of how jarring it is to hit a pothole with 23mm and 120psi, compare to a bigger tyres with a lower pressure.
edscoble
Huh?