1. Prove that life sentences increase in prison crime.
2. Prove that attempted prison escapes BY people with life sentences w/o parole lead to crime.
3. Prove that gang/cartel/etc. leaders who are executed are either a) not replaced b)more or equally violent than their successors
Until you can prove that, then all you have is opinion. The absolute "the DP does not increase safety anymore than LS" is an opinion. However, your absolute arguments against that absolute are also opinions. Your error is in assuming that your absolutes are fact - they aren't - unless you can provide facts to back them up.