For evolution to be exclusively about competition, conflict would have to be permanent. We would never get anywhere by working together, and we would never reprioritize personal gain for the sake of teamwork. Our regular lives show us that can't be true.
Every day we wake up and cooperate with others to achieve goals.
When people talk about survival of the fittest, they're often rationalizing a cutthroat approach. The reality tends to be a lot more docile than that worldview might suggest.
When we get things done in our jobs, families, partnerships, and projects, we're almost always working with others to make something positive happen.
Far from notions of hard knocks, evolution is collaborative.