Where I'm from, contrails are so small and irrelevant compared to the giant cumulonimbus clouds that form in the high heat and humidity. It's like tears in the rain in comparison.
I don't know what to tell you, they are not irrelevant even if they visually look irrelevant from where you are. Small things can have a big impact, CO2 is only ~0.04% of the atmosphere (compared to the ideal level of ~0.03%) and it's causing us major problems.
Right there is local climate too that has different effects.
Imagine a large city in an area that is always cloudy versus one in a sunny desert. They are both the same size, but the one in the desert is going to have an absolutely massive amount of evening heat release due to the urban heatsink effect.