The first couple are because of an over-protective government that doesn't think it's citizens can handle trauma on it's own, or they think it might cause hatred against a certain class of people.
The settlement can be answered the Victim Compensation Fund's website
under the FAQs
[ QUOTE ]
The September 11th Victim Compensation Fund is part of legislation passed by Congress and signed into law by the President to provide compensation for economic and non-economic loss to individuals or relatives of deceased individuals who were killed or physically injured as a result of the terrorist-related aircraft crashes of September 11, 2001.
The Fund is designed to provide a no-fault alternative to tort litigation for individuals who were physically injured or killed as a result of the aircraft hijackings and crashes on September 11, 2001.
[/ QUOTE ]
The last few can probably be traced to human fallibility somewhere along the line.