Sure, but lying about whether your product kills people is still a crime. They're not suing oil. They're suing Exxon for lying about it and funding lies.
Do you think a corporation encouraging extensive oil use at all cost is the same thing as "oil saves lives?"
It's not.
There are no realistic alternatives to 99% of our current use of oil which includes more or less any product used in a modern civilization so unless you can point me to some alternatives I think you are the one who has the immoral position.
Exxon could've just been honest and oil would still have been sold and used and saved people, we could've just been using it more responsibly.
But they lied, for profit.