Of course it is possible to make accounts and scam people. "We" can't stop this. "You" can take appropriate precautions (such as using escrow by a trusted member, not going first when trading with a newbie, etc.)

I see this as a part of the greater cryptocurrency experiment. To use cryptocurrencies properly, people need to learn how to work with trust, escrow, etc. when faced with anonymous transaction partners. People who "don't get it" will pay for costly tuition...

Onkel Paul