Lets take ‘life’ as a general principle rather than an attribute. Life is dependant on a complex interconnected web of interactions between a diverse range of individual beings in all forms from the microscopic to the galactic and universal.
Killing myriad lifeforms indiscriminately has already halved the biodiversity on this planet, and is set to render this planet uninhabitable by higher conscious biological lifeforms within our lifetimes (can get the research data for those who require proof).
Meanwhile, the contributing factors to this mass desecration of ‘life’ are known, enforcement of the paradigm where this destruction is rampant continues to escalate, and the viable alternatives to self annihilation by the human species is available but opposed by the current system of global exchange and resource distribution.

It is in this context that I ask my question:
Which right has greater social license – the right to protect and preserve life – or the right to kill?

Please do analyse the question, I think essays would be appropriate, the qualified views of academics and lay persons alike would be a valuable asset to those who would do something else instead.