Watched A Quiet Place: Day One last night-- terrible

I went in with zero knowledge but just wanted to see how they portrayed them more.

1 - Their hearing capabilities were all over the place. Sometimes they could hear a book shuffle from a quarter mile away.

2 - It made no sense that they weren't distracted by the own noise they make. Ostensibly these things would be running in circles responding to the noises they all make themselves across Manhattan.

3 - The scene where the military flew overhead and said hey everyone go to this spot, then everyone joined together in one mass slow shuffle quietly. The frick? Clearly they had figured out they were attracted to noise as no one was talking, but they thought it made sense to walk in one massive group across a field of debris?

4 - If the idiots on the ground figured out they were drawn to noise, surely the military would have figured out that all you need to do is drop a boombox in an open area and have a couple C-130 gunships eradicate the entire problem.

5 - It made no sense that they didn't have at least the slightest sense of smell or were otherwise incapable of detecting their prey when they were five feet away.

6 - So would every island nation be completely fine? Australia, all of Indonesia, Hawaii, Japan. England? I mean depending on where they landed most of the world should be completely fine, right? Even Martha's Vineyard would be invincible.