Second, that you think calling the poster a "loser" is important is telling. What do you think that will accomplish? Has insulting people ever won them over to your position, in your experience? Or were you banking on everyone's agreement, effectively forcing an internet shaming?
Nobody has ever won against Washington, D.C. by scoring a symbolic personal victory against a few minions. Even if you are like McVeigh and willing to accept a certain degree of collateral damage, it has no effect. It turns out that blowing up a Federal building is the political equivalent of putting itching powder in Uncle Sam's shorts.
So if that is the case, sending an outspoken email is a pre-defeated strategy. It is the action of someone who lost before they started, a loser.