In what way can patriotism be toxic

Patriotism is the idea of being patriotic towards one's country. This meaning that one could put up a flag in the honor of their country, or just simply support their government. This could be toxic by being too powerful. One could be so patriotic that they lose light as to what they are patriotic for. They could be hateful to those who are not patriotic, they could be so involved with their country that it consumes them and becomes an obsession. Patriotism is toxic because it is very powerful