This is a pretty broad statement considering the fact that he is basing it on one country - Japan. And as this CNN article points out, there may be other, less incendiary reasons for Japanese students not coming to America to study.

CNN:

Speaking with CNN foreign affairs correspondent Jill Dougherty in Tokyo, Secretary of State John Kerry said he'd discussed the situation with officials there who said students felt unsafe in the United States.

"We had an interesting discussion about why fewer students are coming to, particularly from Japan, to study in the United States, and one of the responses I got from our officials from conversations with parents here is that they're actually scared. They think they're not safe in the United States and so they don't come," Kerry said.

He noted Japan's restrictive gun laws - which prevent private ownership of nearly all firearms, including handguns - and said the country was safer "where people are not running around with guns."

In 2011, Japan sent 21,290 students to study in the United States, making it the seventh largest country of origin for international scholars. That was down 14% from the previous year, according to numbers from the Institute of International Education.

Figures have shown international study is down markedly among Japanese students to all destinations, including the United States. Experts have attributed the decline to Japan's low birthrate, the expense of foreign study in a poor economy, and a desire among Japanese young people to remain at home rather than venture to other countries. (Emphasis mine)

Kerry, still trying to play politician, has thrust himself into the debate over gun control - and made an ass of himself. Perhaps the secretary could fill us in on other countries where he can actually prove that students refuse to come here because they're scared of gun violence?

I thought not.