So, holding companies responsible for the product they make and try to downplay the effects of isn’t right because there are more steps after them to create the emissions? While they knowingly have misinformed the end users about the impacts of their products? Yeah that’s absolutely nonsense.

1. Why? State companies are just as accountable. They’ve known about this since the 1960s. The goal is to substantially reduce greenhouse gas emissions. Time is of the essence, so we need to put our efforts where it matters the most.
2. To all stop existing? No, as of yet they are still necessary for some chemical processes and back-up power generators for vital infrastructure like hospitals. But we can completely stop using fossil fuels for power generation and travel over land. So they will need to drastically change their operations away from oil and gas. They can go into green hydrogen production or focus on EV charging stations. And yes, it helps to hit them where it makes a difference. Put emission taxes on every molecule of carbon they pump out of the earth. Because the only way it doesn’t end up in the air is to leave it there.

Your reductio ad absurdum is ridiculous. Who ever said we should just have a stern conversation with them? The EU for example can impose restrictions, rules and taxes. Countries can accelerate the transition to green energy through their state-owned energy companies. We can sanction countries who don’t do their part.