Not entirely, but war can be more lethal:
http://www.jstor.org/discover/10.230...=3737864&uid=2
Ebola can become more lethal:
http://consumer.healthday.com/health...ds-695692.html
And even Al Qaeda can become more lethal:
http://www.jamestown.org/programs/tm...238&no_cache=1
None of those imply that people who get killed get *more* killed, it usually means that out of a certain group of targeted people, fewer survive if something or someone becomes more lethal. Indirectly that means if someone or something kills more people, it or she is more lethal, after all the "target group" can be defined as e.g. all people of a certain city, so the more cityzens a nuke can kill, the more lethal it is. Therefore making a nuclear bomb more accurate to make it more likely to hit the point of a city where it causes the most deaths makes it more lethal. Just like Britain's most lethal sniper is the one who killed the most insurgents where the insurgents are the target group. Being the most lethal sniper implies that he is more lethal than all other snipers and therefore more lethal in the sense of killing more people is a thing, q.e.d.
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