This isn't even factoring how powerful the Mirror-Universe Wesley Crusher is in STO.
He was on a different level.
No, it wasn't. For reasons I feel are painfully obvious.
Nevermind the Douwd:
PICARD: What happened on Rana Four? The truth this time. All of it.
KEVIN: Very well. For what it's worth. I am a Douwd. An immortal being of disguises and false surroundings. I have lived in this galaxy for many thousands of years although until today, no one has known my true identity. Once, while traveling in human form, I chanced to fall in love with an Earth woman. I put aside my powers and became her husband. Our life was happy and rich. Eventually we came to this planet to live our final years. Now she is dead. She never knew what I really was.
PICARD: Your colony was attacked by a warship.
KEVIN: Belonging to the Husnock, a species of hideous intelligence who knew only aggression and destruction. I could have destroyed them with a mere thought, but I did not do so.
CRUSHER: You had the power to stop them but you didn't?
KEVIN: I refused to for the same reason I refused to stop the Enterprise. I will not kill.
PICARD: So you let the colonists fight a hopeless battle.
KEVIN: I tried to fool the Husnock as I tried to fool you. It only made them angrier. More cruel.
PICARD: And then what you most feared, happened. Rishon went to fight with the colonists, and died with them.
KEVIN: How I wish I could have died with her.
PICARD: But you couldn't. You were left alone.
KEVIN: Yes. I saw her broken body. I went insane. My hatred exploded, and in an instant of grief I destroyed the Husnock.
CRUSHER: Why did you try to hide this from all of us? Was it out of guilt for not helping Rishon and the others when they were alive?
KEVIN: No, no, no, no. You don't understand the scope of my crime. I didn't kill just one Husnock, or a hundred, or a thousand. I killed them all. All Husnock everywhere. Are eleven thousand people worth fifty billion? Is the love of a woman worth the destruction of an entire species? This is the sin I tried so hard to keep you from learning now. Why I wanted to chase you from Rana.
PICARD: We're not qualified to be your judges. We have no law to fit your crime. You're free to return to the planet and to make Rishon live again.
(From TNG's The Survivors)