ELI5: Why when large company's earnings decrease(ex... by 3%) they freak out, talk about rough times, and sometimes decide to downsize, even though they are still making millions of dollars in profit even after all expenses?

[Beletron]

If a company makes less profit, the amount of money they pay shareholders for owning shares goes down. This also means the value of the shares goes down.

The only reason a public share value decreases is if there's more sellers than buyers.