From crown-to-toe, top-full of direst cruelty

Seeing how I have read Macbeth more than once, my reaction to Lady Macbeth's odd ramblings and soliloquies still remains the same. She's really a lunatic. The concept, even in a play, that someone wants to be stripped of kindness and compassion for the ultimate goal of power, is still sickening to me. With what happens at the end of the play, I reassert the idea of greed can be the stem of all evil. If not for the idea that Lady Macbeth, and Macbeth could be queen and king, she might not have been so eager to be filled with "direst cruelty". I have a hard time even processing the idea of WANTING to be a worse person in the name of absolutely nothing but more than you have. But i think the meaning behind is more than just Lady Macbeth's insanity. I feel the bigger statement made is that sometimes in order to do things that might be deemed as harsh or mean in society, we have to first ourselves become harsh and cruel to carry it out. Even if it isn't as monumental as killing someone, the concept can apply if you are a "yes man" or an overly nice person. If you can't work up the courage to say no to someone, then you would want to "from crown-to-toe, top-full of direst cruelty". I may personally disagree with that saying or quote but i still think it applies to multiple things we do throughout or lives and days.