Fair grounds for dismissal means that an employee is behaving in an undesirable way and is aware that the behaviour is not acceptable. As an employer, you are therefore obliged to make the employee aware that you consider their behaviour to be improper.
Misconduct, such as failure to cooperate, incompetence and poor work performance, can be fair grounds for dismissal on grounds of misconduct.
So yes, again we agree, there is a law of misconduct. Can you demonstrate any reasonable example where an employer in Sweden was fired on such grounds because they protest peacefully against their own company making an unethical deal with a questionable government or the like?