Where is the space for protest?

With this question in mind, we went on a journey through the Kunsthaus Zürich. From the small entrance area, through the gigantic foyer, up the steep staircase until we reached the Emil Bührle collection on the top floor. Walking through the exhibition gave me pause for thought. A businessman who was primarily active in the arms industry and thus became a wealthy personality. This enabled him to acquire important works of art, which we are now looking at. Is this justifiable with our current level of knowledge or even important to make us aware of this history? Is this perhaps an exhibition of protest?