Here, we agree. The mention of slippery slopes, death camps, euthenasia (possibly as a solution to the Social Security problems), are all intended toward that goal, imho.
Unfortunately, we live in an age which requires 'shock and awe' to get the attention of the masses, and one which has desensitized those same masses to the 'shock and awe' required.
That, perhaps, is the most frightening aspect of all of this.
As far as the comparisons between the Terri Schaivo case and the holocaust of Nazi Germany goes, if the Nazis were responsible for the H-O-L-O-C-A-U-S-T, then the Schaivo case is the H. Sure you can't compare the murder of 1 to the extermination of 6 million, but you can't get to 6 million without 1.