Respuesta :
Lago's plan starts to fall in place because he lacks moral restraint and callously exploits Othello's hamartia, his trusting nature, to cause chaos and strife among the characters.
Since Lago callously exploits Othello's hamartia and his trusting nature to cause chaos and strife among the characters, Lago's lack of moral restraint causes his plan to fall into place.
Here is one way.
Here is one way.