I'm convinced A LOT of people don't know how to use round-a-bouts.
Round-a-bouts have been slowly becoming more popular in my area, as it helps replace 4-way stop signs and keeps the flow of traffic moving. HOWEVER, people need to learn when to YIELD before entering the round-a-bout and let people who are actually in IT to drive and exit safely. But also, don't STOP in the round-a-bout to let people in. You have the right-of-way.
I almost got into a fucking car accident the other week because one driver wanted to suddenly stop in the round-a-bout to let someone in. And then, what appeared to be a new driver, didn't yield and ran through the round-a-bout instead of yielding.
Round-a-bouts are not complicated contraptions.