Human instinct: evolved or dissolved?

As a result of our civilized perception of ourselves and dissociation of our own animalistic past, we have come to believe that transcended human savagery is now a thing of the past. A denial almost so accepted that early man and the devolved beings before him down to australapithisis are a myth, a fabrication despite all the evidence thus far. Undeniably we have instilled in ourselves the remnants of a past evolution surfacing as survival instincts.
Think for a moment you are taking a hike down a dark path alone, with no one in sight. It is a path you have traveled many times before, you know every ditch and slippery patch of gravel. Tonight you hear a shutter in the bush behind you. Suddenly your pupils dilate for keener vision, your heart begins to pound and muscles tight as you begin to walk faster, breath heavier. Then out of the shadowed brush comes a curious cat fresh from stalking a field mouse.
From the very moment you heard that noise even though you were in comfortable place, Your survival instinct overcame you. Fight or flee is your only reactions at that point. Your mind may be creating demons or stalker images in the shadow because thats all we know to prey on us. If it were early man it would have been a saber tooth cat and one of you would be dinner. Theft and status can also be contributed to this, irrational as it may sound. Stealing can be a remnant of our hunter gather instinct unless it's compulsive. People don't steal lack luster things, E.g he is gathering by the act and hunting by the preference. Status too dates to a time when a single man would have to prove himself in order to join a tribe or court a woman.
Procreation and segregation is the last subject I will delve into. When a man passes a woman he will glance, if only for a second at the woman to evaluate her figure. Unconsciously he evaluated her ability to bear child by her breasts,Hips,and general figure. All things important in childbirth. opposite the woman now bears more flesh than ever in those very departments also for the same reason. In the age of open mindedness we have casual sex, protected so not to have children, But the timeline from glance to sexual encounter is all being evaluated in the primitive mind to produce a strong child.
Now "civilized" we learn threw evolution to dissolve the need to act out certain taboos, That by the way we as humans created the standard. All due to a lazy early ancestor of ours who found an easier way to gather food and store it so he could just think. And think he did, so followed many others "monkey see monkey do" now instead of the nutrients going to his hunter muscles the brain requires more and more. Now here we are still eating and thinking.
I am not saying we are cave men and will not blame the worlds negligence and need for superiority on our primitive remnant because we have evolved. I wrote this because I would like people to remember that as much as we like to think we are superhuman and intellectual dynamos, we are still just as much an animal as our curious stalking cat from the bush. we are just more domesticated.