Jumping to Conclusions

I babysit a little girl three days a week.  She is about three months younger than Truck boy.  Most days they play together well but some days they can't seem to get along at all.  She's soft and meek and my son, who is really kind of a woos, has found that he can push her around a little.  They're two and no I don't allow it but it happens sometimes.  Often they would be playing together nicely, then suddenly the girl would be sobbing huge crocodile tears.  Sometimes I would turn in time to see my son snatch something from her grasp.  Sometimes she would point at his toy and cry.  I always assumed he had stolen it from her.  I gave it back to her and my son had to sit in time out.  Well, one day I watched a little closer.  My son was playing with a toy and she grabbed it from him. when he took it back she started crying.  She had quite the racket going.   I'm sure some of the time he was the instigator but I learned never to jump to conclusions on only partial evidence. 

Sometimes when editing I think I know the problem with a scene.  It's the pov, or the plot, or the underpainting.  And I jump in to fix it, rewriting here, tweaking there, the whole while thinking it will be brilliant, only to find I still didn't fix the problem.  I need to stop jumping to conclusions, sit back and think a little.  If I do I find things I hadn't thought of before and the scene shapes up nicely.  Each day when I'm done with my editing I try to read over the next scene to get an idea of what it needs.  Then I can let it percolate in the back of my mind until my next writing session.  

How about you?  Do you jump in, think exhaustively, or a combination of the two?