The situation with the Lionfish in an unnatural ecosystem (eastern states/Atlantic Ocean, Caribbean, Gulf of Mexico) is a dangerous thing.
No matter what view you take on it, there is always going to be a group in opposition. The reefs are in desperate need of extreme conservation. Most recently, the devastation of reef along the Florida coast was horrible. So many factors are contributing to the delicate balance in the waters, that whatever choice conservators, lawmakers, and the open public take - it will be a long and arduous task.
I recently took an Oceanography class and the professor is a scientist studying the dolphins in the bahamas along with the effect of the Lionfish rapid take-over of the waters. They are working to find a solution to the problem.
Personally, I believe that the least invasive way of eradication with minimal impact to the ecosystem would be optimal. However, that is probably short of a miracle. Anytime a "nuissance" species is addressed, another suffers. Hopefully, the Lionfish dilemma can be solved with patience and strict guidelines.
I have not seen any lions while snorkeling off the West Palm Beach & Jupiter, FL waters. I have seen some amazing French Angels and Foxface.