Difficult to enjoy due to plenty of illogical story setting

Rating: 1/10 (6 April 2018)

When you watch the trailer, the concept of the movie is simple: if you make noise, you get killed.
All characters tried to be slient at the very beginning of the movie, which seems to be a bit tense and exciting. However you will soon find out it is not necessary for them to do so. When to background noise is large enough, they can still make sound. So why don't they set up speakers and live around the speaker?
By using a mattress to cover the entrance of the basement, they hid their trace from the monster. So why don't they just live normally in the basement with the mattress covered the entrance? It is completely not necessary for them to be so quiet.
Evelyn got pregnant after those monster had appeared; then gave birth to the baby; but I don't think it is logical to have child in that environment. The baby was so intentionally added to the stroy but did't make sense.
Almost at the end of the movie, the monster attacked the Truck which the 2 child got into. This was again illogical because they did really made any noise inside the truck. For a living creature attacking a load of "non-edible hard material", this was not making sense at all. Why won't the monster attack the rock near the waterfall by using the same sense?
Dad screamed in order to save his children and then the son drove the car home. I doubt if they don't drive in their daily living. The car would made noise for sure but the children escaped.
The most disappointing thing is that the monster was killed simply by a gun. I believed that every one of them(or at least the adult) should have carried a gun along.
I believed there are a lot of fake reviews for this movie and this do weaken the creadibility of IMDB to me. This movie definitely not deserving any rating above 5 out of 10. I am a bit disappointed on IMDB as well.