"Since when has the "right" to life been transformed into a requirement to live?"
Kind of like how the "right to trial by jury" doesn't mean that you can't just plead guilty and skip right ahead to sentencing.
Once you have established a privileged class of professional killers, it's only a matter of time until they branch out beyond the original targets into other ranks.
Please notice that after 12 years of opportunity, not another state has passed such murder enabling legislation as has been passed in Oregon.