In How do I know if it's safe to travel to a country at a specific time? , the main suggestion for determining the safety of travel to a certain country are travel advice agencies run by governments.
This may be good for advice about which countries to expect hypothermia in, and which countries to expect heat stroke, but is there the risk of sites not mentioning certain risks due to political interference?
For example, I assume most government travel advice sites will have information on the radiation situation in Japan. But a lot of people (including Japanese citizens) distrust the Japanese government, and I wouldn't be surprised if they suspect the government of not only being willing to misinform its own citizens, but also being willing to stop other governments from providing accurate information about the safety of visiting Japan. (Though they haven't stopped safecast.org from operating)
Another potential source of information are travel guides. But they may have a conflict of interest, in that if they describe a country as being unsafe to travel to, people may decide not to buy guidebooks for that country.
Yet another potential source of information is mainstream media news reports. I don't really trust them, because they may be biased because of the owners, staff or target audience, and also sensationalistic but inaccurate reporting may be good for sales. Also, they may accept money for tourism advertising, which would be another source of conflict of interest.
How well founded are these concerns? Are there alternatives, such as well-funded and professional online resources solely dedicated to the safety of destinations?