If there is an direct attack on these bio-scientists it is more likely by a leftists that believes these type of scientists are better off dead. I hear it often from leftists but have not seen it take place yet.
About dentists death rates. a quick Internet search:
For some odd reason white male doctors have a high suicide rate.
http://www.straightdope.com/columns/010420.html
I would tend to think from the list at steven quayles site most of the deaths are unsolved. We have no idea of how many Manchurian type people are here in this country.