What century are you living in ? Cruise missiles (which result in no casualties for their user) have been used without hesitation for decades in situations in which ground troops would not have been sent. Similarly bombing missions are carried out against ISIS precisely because they don't have the necessary anti-aircraft defenses. Same with the more modern UCAVs. Arms manufacturers invest heavily in the development of unmanned weapons because there are expensive and useful to politicians who want to be able to do something without having to deal with the families of dead soldiers. War has been easy for a long time. If troops are indispensable then it is a bit harder but not that much given the ridiculously disproportionate casualty numbers between sophisticated and unsophisticated armies.