Why there exist deadly wild animals?

August 19th 2020 (waiting for JEE mains in the month of Sept) 

Why does leopards exist? Why do in the evolution ladder these wild dangerous animals evolved before humans species? I mean, before these wild cats there were other deadly animals, threat to homo sapiens existance and their proper evolution.

We  all know they were there to kill us at any improper mutation we would have in our species or to say, predators in any form have existed in the world to lay down a path for a crooked amoeba to convert into humans as we are today. 

But can this all be a part of a bigger picture? Can the problems of existance in the life of a amoeba be pre planned and re-updated as it evolves through the passing of time? Are we made to evolve like this way, in which we have already evolved not by some random probability but by some external force? The external force which was preparing us for a bigger mission of which we don't know of yet? The external power who created us for solving a much bigger problem than this own planet? 

As kids we are taught to solve problems and all my life I use to tell myself that I am learning to solve these problems because solving problems is one thing in which we humans are good at. We all are learning to solve maths questions so that we may develop the necessary brain power needed to solve energy crisis, deadly virus threat, diplomatic relations between nations, or problems like finding a new way to poop in space where there is zero gravity. 

But now I'm asking myself were those predators were there to refine us humans through out the evolution in such a way so that we may become competent enough to solve maths questions and become competent futhur to occupying Mars, to become competent even further to serve a bigger purpose held by that external force which is still to be announced?