Without getting too carried away on a single aspect of an issue which is not dependent on that aspect, I'll offer a few more observations and let it drop.
1. Embarrassing quotes by "popular" politicians are a lot harder to find than the other sort.
2. The language barrier for those of us (such as myself) who are limited to English, makes certain kinds of web searches virtually impossible.
3. Finding archives of transcripts and/or older articles can be fantastically difficult on the web as items frequently expire within a fairly short time span.
FWIW I don't fully discount all of your objections to the quote. If it were available, I'd love to see a credible transcript and translation of the speech and the context in which the statement was made. Regardless of my own views, which have developed over a period of time, I have an automatic distaste for slanted opinion pieces, even when the basic information is something I happen to agree with. I also have a strong tendency to reject anything which quotes anonymous sources.
As far as the Sharon quote is concerned, it is attributed to a specific broadcast, on a specific date, of a specific event. It has had a fairly wide distribution, from numerous sources, without a known conflicting retraction. For reliability, I'd probably rate it at 85%-90% without an official transcript, which would raise the bar to 100%.
If you find the quote incredible, start out easy and try a web search on "Mossad".
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