Did I just find a logical fallacy in the words of Jesus?

Matthew 5:27–28New International Version (NIV)

27 “You have heard that it was said, ‘You shall not commit adultery.’[e] 28 But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart.

Ok, sounds arguably ethical. The idea being that a thought of sin is somehow equal to physical sin. And surely temptation is not equal to sin.

But what about the other way around? Shouldn’t one also be able to simply “think” good thoughts towards filling the empty hungry bellies of poor uneducated children who have no future… and that be equal to the physical act of helping them out? Shouldn’t there be another set of verses in the Bible that claim something to the effect of…

“You have heard that it was said, ‘You shall feed the starving children’. But I tell you that anyone who looks at a starving child givingly has saved a starving child in his heart”.

What the fuck would be so great about saving a starving child in my heart? What good would that do for the child? How would that be doing the lords work? And if that’s not doing the lords work, then how the fuck would lusting after a woman be the same as committing adultery thereby doing the debils work? What harm would that do the woman? What if she’s lusting after me? What harm does that do me?

Are “bad” thoughts only equal to reality? Or are good thoughts equal to reality too? Is this a double standard?