ok so bitcoin removes the middle man right?

but then who or what ensures and enforces that both parties are being honest?, isn't that the job OF a middle man to ensure security?

i encountered this problem right away when i decided to purchase some bitcoin...

if i send cash first, the's no guarantee i'll get bitcoins in return.

if i trade it in person, then at least there's a person i can beat up >.>


i mean, isn't this the very basis of government, as this 'public' third party figure, because people ultimately are unable to trust each other.