Americans reduce the Middle vowel to schwa in the adjective form but not the verb form, so you'll often see the adjective spelled with an e and the verb with an a.

In the US, all vowels are part of the same letter pool, you can pick any one of them when needed.

Because they tend to be stupid, and barely literate

"On accident"..?

Shameful.

It’s phonetically correct for me even thought I know it’s an A it sounds like an ER to my ear