Well, if you’re just talking about what “many people” think, then I’d say that in that sense, it’s just as much a moral right to take life at times as it is to give life, according to a lot of people. For instance, most westerners think that killing a large number of Germans to stop Hitler’s power grab in WWII was the morally correct thing to do.
Collectively, we as a species tend to find justifications for those things that our biological imperatives compel us to do in any case.. people are driven, at times, both to reproduce and to kill each other in competition for resources or to protect ourselves – so both actions are a “moral right”, according to a lot of people.
Interestingly, I realized as I typed that competing for resources and protecting ourselves are probably both seen as “moral rights”, ultimately, because they allow us to continue more effectively reproducing.. so maybe you could even say that taking life is a “moral right”, to many people, if/when it’s done in service of allowing more life to be given..?