They are selfish and ignorant and put those who genuinely can't be vaccinated (for real medical reasons) at greater risk than they need to be. People have become blase to many diseases because society has forgotten just how devastating they can be and now some of these that are easily preventable are making a comeback.
It's also a sad indictment of the scientific community that this came from them and was allowed to fester. They failed and did too little too late.
Let's not even get started on the media ... they'll regurgitate any old BS.