You would be horrified by how many people either simply don’t believe the warnings or think they can ride out the storm because they have done so in the past, especially in Florida. A neighbour’s father was actually among those that were sadly killed by Hurricane Irma when he refused to live his beach house and then decided to go check on his boat.
Whilst some people could be missed, that is always possible with responses this broad and complex in scope, emergency services always prioritise those people that are known to be unable to evacuate on their own (or would have extreme difficulty doing so), and they are usually the first to be assisted well before the storm arrives.
Barring some truly dumbfounding incompetence—and this is Florida we are talking about, so that definitely cannot be ruled out—the vast majority that will have remained as the hurricane hits will have done so of their own accord, and should know the risk they are taking on (many emergency services have said, unequivocally, that if you remain in mandatory evacuation zones you will not be rescued).