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“Fortunately, the movement doesn’t urge people to cut tires or their valve stems…”

Mass is mass. Space is space.

SUVs take up space, killing government's return on asset when building transportation infrastructure.

Energy still has to be produced to physically move 3t+ of mass around. And typically, SUVs only carry 1 person in traffic. So, that is 3t per person versus a bicycle, which is 0.020t per person.

Living in Canada, an SUV is a useful vehicle in the 4-5 months it snows. Optimum would be to have a winter vs. non-winter vehicle, but that's expensive. And, most models of SUV are really station wagons with different sheet metal and larger tires - only a limited subset are built on a truck frame.

Just deflating them, not destroying them

The weight of the rim edge on the sidewall of the tire can damage it leading to early failure. So, yes, it does at least damage them.