The conspirators did not attack Antony because of fear. This is from a book called The Tragedy of Julius Caesar Act 2.
they all die!
they did not kill mark Antony and he acted to get reveng by killing the conspirators.
Mark Antony
So they could kill him
The favor that Antony asks of the conspirators is to speak at Caesar's funeral. They eventually let him, however Brutus gives him guidelines/restrictions that he must agree too or else he will not be allowed to speak at the funeral.
Antony and Octaveous were both not conspirators against Caesar.
they all die!
Caesar was killed by several conspirators, the primary ones being Cassius and Brutus. Antony finds the conspirators actually standing over the body after Caesar was killed.
they did not kill mark Antony and he acted to get reveng by killing the conspirators.
He convinced the citizens of Rome that the conspirators had lied about why they had killed Caesar.
To deliver Caesar's eulogy (funeral speech)
Mark Antony
well, because for one Antony is Caesar's friend and for two he wants revenge on the conspirators for killing his best friend. So to get revenge on the conspirators Antony is going to get the crowd to turn against the conspirators and get back at them for murdering Caesar.
So they could kill him
No, Marc Antony was a staunch supporter of Caesar and also was Caesar's co-consul at the time of Caesar's death. In fact, he ran and hid for a day of two until he was certain that the conspirators were not after him too.
When Mark Antony got to know that the conspirators killed Caesar, he was enraged because he was very close to Caesar. But there were other reasons for him wanting revenge besides Caesar's death. Cicero, a sympathizer with the conspirators, attacked him viciously and Cicero was also responsible for the death of Antony's stepfather.
Trebonius lures Antony away from Caesar so the murderers can get to him.