a) It's impossible to know what the government's response is because news organizations aren't covering the destruction like they would if it were somewhere more accessible. Basically nobody can get into or out of the worst-hit areas right now. In many cases literally the only way in or out is on foot or by helicopter. The people responding are way too busy to post crap on social media.
b) With our federal system, FEMA and the feds can basically only provide assistance to state authorities, who are mostly providing assistance to local authorities. Federal support is ramping up as quickly as it can and supporting the areas that can actually be helped the most right now. It's not just a question of who needs help the most. Logistics are a real thing, and they need to get things to where they can do the most good, and the "where" is sometimes counterintuitive to laypeople like you and me.
c) The biggest role of FEMA and other federal agencies is going to be in the next weeks, months, and years, not in the immediate aftermath. It's going to be rebuilding roads and bridges. Those efforts won't be apparent for quite a while because they aren't overnight projects.
Routine response to this sort of thing. Always silly. How often do you give someone $100 in order to save $21 that you owe to someone else? Donations like this are a net outflow of $79 for every $100 donated in the best case for them.