Lots of things. Cars, cancer, cigarettes, cops. Cops?
There's been a few high-profile police shootings recently. In the USA, of course. So I looked up the statistics for police killings, and apparently in 2014, the total was 593, and each year before that, the number is in the hundreds. No doubt some of those were unavoidable; if someone is trying to kill an officer, then a couple of rounds in return seems like reasonable use of the cop's gun. But a disturbing number of police shootings seem to be completely unjustified. Should you shoot in the back and kill an unarmed man running away after a traffic stop?
So I looked at the UK; not a comparable country, but it's where I live, and the figure isn't just for shootings, it's for killings by whatever means. In 2014, one. In 2013, none. One in 2012, one in 2011, ... you get the idea.
Of course, police here don't routinely carry guns, except in airports and places where a terrorist attack is conceivable. So let's look at Germany, whee the police do carry guns.
One in 2015. One in 2013. Four in 2012. Three in 2011, three in 2010, one in 2009. You get the idea.
I'm *so* glad I live here!