As far as the war is concerned, I consider it a necessary evil because of people like Hitler and Osama bin Laden.  Or would you prefer living under the Nazism or radical Islam?  Osama bin Laden was at war with us long before we were at war with him and his friends.  I also consider the death penalty a necessary evil for the same reason as war.  Again, I do not like either one but accept that there are times it is necessary.   
Concerning our country promoting war, we are not as bad as you make out.  I would refer you back again to Germany and 2 World Wars.  
 Also, do you really want to encourage people to kill themselves or maybe you would prefer to have somebody kill you.   I will also grant, on a very limited basis, that sometimes it is better for a mercy killing, either by suicide or assisted.  Again, this is with the idea that life is valuable and precious and not to be thrown away.  I fear that encouraging even this limited exception puts us on that slippery slope.