Whether Caesar would have been a tyrant is up for debate, but my biggest question is why Antony still praises Brutus by the end of the play?

I've finished rereading this one and can't make heads or tails of it all, from the authors perspective or even my own.

After all is said and done he says that only Brutus was honorable among all of the conspirators, and Antony might not know, but we as the audience do that Brutus was at least partly swayed by the false letters Cassius had put of the people praising Brutus to overthrow Caesar. Isn't that kind of arrogance more dishonorable?

And I can see the arguement that maybe Brutus was the only conspirator to have lofty/righteous reasons for the murder, but isn't being blindly lead astray so easily also not worth any praise, and unhonorable? I don't think it's any coincidence Cassius suicide is made such light either- its almost funny how foolishly he takes his own life from poor judgement. And for such a man to fool Brutus isnt even poetic as I see it, and almost makes me think Brutus is a bigger idiot than he was.