History prooves you wrong. Many Monarchs have acting in fashion like this. Saying "It canot be" is just closing your eyes and wishing teh problems away.Yes. If he does not protect the realm, he is not a monarch This is akin to a country without a border. It cannot be.
Same goes for providing safety. If he does not secure peace within, he has bandits running around usurping his power. He is not the sovereign. It cannot be.
And if he does not collect income, how will he manage? There will b others more powerful than him.
Monarchs like everyone else will behave badly. How does the system deal with it.,