To remake or not to remake?

Why do they have to remake movies? I watched the remake of Poltergist today - possibly because of the clown news out of the U.S. (nothing to do with their Presidential race). Over the last few months there have been random (?) sightings of clowns - not nice ones - around various areas of the States. One with a machete apparently even tried to lure a woman into the forest - although I'm not sure that even something as fun (to some folk) as a clown would be able to lure anyone anywhere if it was carrying a machete! I'm not one that;s afraid of clowns - there's even a name for it - but I do know some folk who are! It could be they have seen IT (the Stephen Kong miniseries) with Pennywise the clown or Poltergeist - old or new - with its horrific clowns. Come to think if it even the Simpsons with their Krusty the Clown also has the less than nice clown bed that Bart sleeps in in a Tree house of Horror. For such figures of mirth you have to wonder how clowns ended up with such a bad reputation and why they're always called so-and-so The Clown - as if we can't actually tell that they're clowns by how they look!  But back to the remake of Poltereist - which I'm not giving a rating but which was vastly different and oh so much less subtle than the original.  I understand that technology changes when it comes to movie-making but there was nothing wrong with the old one and so much right with it that it makes me wonder if there isn't any way they can come up with new ideas for movies rather than doing remakes.