To what end? Do SUV owners write bills? Will inconveniencing nonpolitical randos get anyone talking about the issues, let alone talking about them without souring the discussion for climate activists, who now look like vindictive assholes?

This reads like petty vengeance against people with marginally larger carbon footprints and with the wrong kind of social performance, not genuine activism. If you're gonna slash tires, do it to the politicians ffs.

Yeah, they should've thought of that before being too poor to buy multiple vehicles for each situation.

Well, if they want to go shopping right now, chances are for this one trip they'll take their spouses smaller car, public transport or maybe even walk. If SUVs become generally unreliable (because you never know if you have air in your tires when you need it), people will look for something more reliable. They'll bitch about it, they won't act out of conviction or so, but who cares.

These type of actions do have an effect in SUV sales though.

SUVs are justified in rural communities where there either the weather or terrain make small vehicles unviable at best and outright dangerous at worst. I have family in rural Spain who have an SUV because they live halfway up a mountain and a car that can tackle driving along a dried up riverbed was essential. It's less wasteful to keep an SUV for 10 years than buy a small car and have it destroyed by unforgiving terrain in less than 6 months.

I live in rural Michigan where we get several feet of snow each year. I drive a 10 year old used Jeep that was bought in cash with money we saved up so we could have a car that would handle the weather, our family, and the long distances we have to travel to work or shop.