Be careful. Good work ethic doesn't always mean business success. The two are correlated, but that doesn't suggest that tossing money at any Japanese company is the way to go. Still do your due diligence and only invest in solid companies. This is certainly an opportunity, but not a reason to be irresponsible.
Sony, Toyota, Honda, Nintendo, etc. Japanese companies like these that were a great investment a week ago are still a great investment. Only now the stock is less expensive because of a temporary panic. Smart money is buying up all the stock possible for these companies before they can rebound.
The big question is how the operations of each of those companies is affected. If operations are hugely impacted and would require time to rebuild, their stocks will not rebound so easily.
Good point, but if you consider corps like those mentioned by the parent, they are clearly internationally-diversified companies. If their operations in Japan alone are impacted, it's cause for concern, certainly, but the company as a whole is likely none the worse for wear, and this is just Mr. Market overreacting as he likes to do.