This is what the Marvel One-Shots were made for. After the big exploits of the Avengers, we get a street level view of the average person and how they react to the crazy events of this universe. For these characters, they're opportunists who use the alien weapons to rob banks all over the country. Eventually, SHIELD gets the better of them (they always do) and they end up as glorified coffee makers. It's a neat little window into a side of the MCU that we don't see often.