I don't think Israel would bomb the Aswan Dam even if they were being invaded by Egypt, and Jews were being slaughtered in the streets of Israel(God Forbid). But you never know for sure.
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From Gary Stearman's article:
If Israel’s existence were threatened by an Egyptian invasion, drastic measures would be brought into play, The Aswan Dam holds back the enormous Lake Nasser, 340 miles long and 22 miles wide at its widest. If the dam were breached by a nuclear blast, radioactive waters would cover Egypt from one end to the other.
Satellite photos reveal a staggering truth about Egypt. Virtually its entire population lives in close proximity to the Nile River, from Aswan all the way down to Cairo and the Mediterranean Sea. Night photos show the Nile as a narrow river of light that fans out at the Nile Delta. Egypt may be the only country on earth so vulnerable to total destruction.