In almost every City frequented by cruise ships, there are protests. There is the aspect of Air pollution, which is in fact more than Cargo ships, and mostly closer to the city center than the other sources of pollution.

And also tourism of cruise ships tends to swarm the streets on already busy hours. They are more concentrated around the sights and generally overcrowd practically everything.

They are not desirable tourists to have in your City and spend far less money in the city it self - paid excursions from the boat itself, and they eat for free onboard.