Do you think Brutus was right in letting Antony give the funeral speech ?Julius Caesar by William Shakespeare

Having the advantage of knowing what happens to Brutus and
Cassius, who are defeated by Octavius, Marc Antony, and Lucius, the reader must conclude
that Brutus has made a crucial mistake when he does not listen to the advice of
Cassius,

You
know not what you do; donot consent

That Antony speak in
his funeral.

Know you how much the people may be
moved

By that which he will utter?
(23.2.250-253)

As it turns
out, allowing Marc Antony to speak is both detrimental to Brutus and the conspirators as
well as devastating to the people of Rome, who, roused by the words of Antony against
Brutus and the other ironically called "honorable men," riot and effect a civil war. 
This civil war is far more damaging to the state than the tyranny of which Julius Caesar
is suspected.

Added to the condition of the state that
deteriorates because Brutus allows Antony to foment the citizens of Rome, Brutus loses
his wife Portia, who dies purportedly from a lingering illness during the time he is
gone in battle against Antony and the others who prove formidable.  Also, Brutus
quarrels with his friend Cassius, and, finally, is defeated in the battle at Philippi by
Antony, Octavius, and Lucius.  So,in retrospect, had Brutus not allowed Antony to turn
the Romans against him and the other conspirators, and had he slain Antony as Cassius
suggests in Act II, he probably would have been in a better situation to
rule.