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Although boloid strikes in the ocean might trigger glaciation, any major tsunamis could be the death blow to a developed civilization if the bulk of the educated and craftspeople inhabited the shoreline. With glaciation, they would have time to move out of the way. With a tsunami, gone in an instant.

I saw a recent show postulating that this is what happened to Crete. A Thera tsunami destroyed the Minoan ports, shipyards, and shipbuilders. When the craft which survived at sea came home, there was no one to maintain them property or build many new ones. Thus from 100 to 200 years later, the Minoan civilization went into eclipse.

Glaciation due to impact would reach well into the interior and would be sudden; tsunamis from impact would be secondary, and depending on how the sealevel declined, might not hit much of anything. My point was, there wouldn't be anything left to hit. :')

There was no Thera tsunami; the dating for the supposed supereruption (for which there isn't any evidence dating to historical or late prehistoric times) is now far too early to have had anything to do with the end of Minoan civ. Even the old alleged date, ca. 1500 BC, was at least 80 years before the quite sudden end. The Mycenaeans overran everything Minoan, that's the reason for their disappearance.

The pumice sample from Egypt that had for years been saddled on as proof for both the extent and date of the Thera eruption turned out (when it was finally analyzed, guess no one was in a rush) to be from the Kos volcano, which hasn't erupted in tens of thousands of years. The pro-supereruption camp immediately and quite perversely claimed that its origin undermined the short chronology, while in fact it points to the fact that there's no scientific basis for their belief that there was such a supereruption in the first place. :')

New Ice-Core Evidence Challenges the 1620s age for the Santorini (Minoan) Eruption [2004 ]

another reprise:

"Even when, during the respective Thera Conferences, individual scientists had pointed out that the magnitude and significance of the Thera eruption must be estimated as less than previously thought, the conferences acted to strengthen the original hypothesis. The individual experts believed that the arguments advanced by their colleagues were sound, and that the facts of a natural catastrophe were not in doubt... All three factors reflect a fantasy world rather than cool detachment, which is why it so difficult to refute the theory with rational arguments." -- Eberhard Zangger, "The Future of the Past: Archaeology in the 21st Century", pp 49-50.