Communal memory of rare disasters is worse in more developed societies because knowledge now is passed on in schools, movies or the internet leaving no time for oral history or reliance on the elders to learn about the world.
Something similar to the quick-forgetting phenomenon happens in financial markets. In every market, some players prosper for a while by following trading strategies that tend to be highly profitable from day to day but that are almost guaranteed to be big long-term losers: martingales, naked out-of-the-money option writing and other short-gamma strategies. Every time there is a big market event, a lot of these players suffer large losses and go out of business. They move on to other businesses (I assume) and are no longer around to warn market newcomers to avoid the kind of risky, short-term-profitable strategies that they themselves once followed. So there is a constant stream of new traders who enter the markets and rediscover risk.
This is an oversimplification, since the better traders, by definition, somehow learn how to stay in the game for the long term. But the behavioral parallels between market traders and people who rebuild villages in flood zones — and countries that seek to appease their enemies — seem clear. The common element is lack of an adequate inter-generational feedback mechanism. I doubt that there is a remedy for this pattern of human behavior (I wouldn’t characterize it as a “problem” any more than I would say that rain is a weather problem) other than for people to study history more.