They have been trying to ban the breeding and import of some of these breeds in Italy too. There are a number of reasons behind this:

1. dog fighting is a huge problem in Europe and a lot of the breeds you mention are used for this (gruesome) purpose.

2. There has been an increase in attacks by these dogs (especially to children).

3. Some idiotic people use these breeds as “status symbol”. Bullies use their dogs to show off or to prove their so called power.

The result is that these breeds are now associated with aggressiveness and violence. I personally believe that there is no bad breed of dogs, only a large number of ignorant and bad owners.