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You’re making assumptions here.
Scenario 1: You’re assuming that everyone is observing adequate stopping distance, has working brakes, and is adequately paying attention to slow down.
Scenario 2: You’re assuming that green means it’s safe to go and that the cross traffic light turns green simultaneously with a given light going red.
Let’s address the easy stuff first.
In scenario 2, if my light just turned red that means the opposite light just turned green. This isn’t how stop lights work in practice. Usually, both sides of traffic are stopped momentarily before a light turns green such that traffic in the intersection can clear. Also, if you see a stop light that’s red you are usually slowing down. In other words, right before cross traffic gets a green light they are either stopped or slowing down, assuming they can adequately pay attention.
Cars have mass. You don’t instantaneously go from 0 speed to speed limit. It takes a ramp up time. It is generally low risk to run a stop light immediately following a light change.
Now to address both scenarios, we have to talk about defensive driving.