Thought is a good thing. Could there be a way for thinking to be bad?
Well, yeah...
Let's go beyond the motive behind thought. Everyone is entitled to the choice of reacting their own way to their thoughts, and in that regard they are also entitled to the effects or consequences that come from them.
What I want to concentrate more on, however, is the amount of thought we choose to devote to for a particular situation. I'm sure Einstein was thinking a storm prior to sighing, smiling, and finishing his 4th bottle of Rebell Yell before he etched "E = mc²" on a blackboard. Edison must have been as pissed as a 38-year old who just lost his last life after attempting to finish Shinobi for the 39th time; He must have been full of thought before the perfect idea that fit into all of the possible details he had for the incandescent bulb smacked him in the forehead.
I'm also sure that Hitler had so much in his head before he killed himself. I'm sure anyone who made the unfortunate decision to take his own life - Cobain, Socrates, Thích Quảng Đức, and that dude who killed himself immediately after mailing a bomb to a Japanese artist he was obsessed with - they had a certain amount of thought cross their mind before doing the last thing they would ever do on earth.
Not alloting enough thought over a situation can have its own drastic consequences; Taking the examples above, I would think that some of the people mentioned (the last guy in particular) would still be with us today if some extra thought - leading to the proverbial "Wait a minute!" - was made.
So, Brent, should everything have a little extra thought?
I wouldn't think so.
Right now I'm out of ideas for situations of famous people who screwed themselves by thinking too much over one thing. Oh wait. I've seen countless Iron Chef challengers who devoted too much detail over one dish that Masaaki Hirano eventually spat out. Some Fear Factor people could have kicked ass if they spent that final split second pushing, pulling, breathing, and/or swallowing, instead of thinking.
Bottom line is, like anything in life, thinking must be done in moderation.
So, like anything in life, can one become addicted to thinking?