Why are some insects considered good & others bad by apperance only?

Question

For example, caterpillars are very destructive while spiders are usually beneficial.

Answer 1

There is a theory that we are psychologically programmed by evolution to recognize certain insect shapes as being dangerous. Our ancestors were frequently killed by scorpions, spiders, etc. So we have this archetype imprint of a "bad" insect shape that we should avoid. So now, even though that we know better, our lower brain generates an avoidance reaction to anything that resembles a spider, etc. It's sort of like a leftover survival technique in our minds. Thats why when we see something spiderlike, we get a "thats bad" feeling.

Answer 2

I prefer caterpillars to spiders.

Answer 3

And everybody thinks ladybugs are cute.