I am leaving my company - should I inform top mgmt of major IT issues?

I have been working in my company's IT department for 8 years.  The company is 
downsizing, and I got caught up in the latest round.

My company's IT department is severely damaging the company and risking the 
company's thousands of jobs by being so imcompetent.

Should I inform my company's top mgmt of specific technical issues in their IT 
department that are destroying the company?

Should I go out with a bang?  Or gracefully (without informing mgmt)?


Reasons to inform mgmt:
  a..     Seems like the right thing to do
  b..     They might make needed changes and turn the company around
  c..     They need to make serious and fundamental IT changes to survive
  d..     Maybe they will keep me on staff


Reasons NOT to inform mgmt:
  a..     It is sticking my nose where it doesn't belong
  b..     No one else does this type of thing
  c..     It would probably sound like just another disgruntled employee 
spewing giberish
  d..     It could cause a shakeup in the IT department and I would lose 
friends and the respect of former co-workers

Has anyone tried informing top mgmt of problems upon exit of the company?  Was 
there anything positive that came out of doing this?

Thanks!