Time traveling photography, Would you be the good guy or the bad guy?

If you had the chance to go back or forward in time would you use your photography skills just to make money or solve the crimes and mystery's of the world and protect our future?
Would you be the good guy or the bad guy?

Probably both. I would definitely enjoy the money and it would help in the pursuit of the best equipment to capture all the mysteries, past present and future. Imagine a shot of Cromagnon man done with any camera you could choose? I would also have some foreboding about showing those pictures, you would either be accused of faking them, or you would have to explain how you shot them and then people would just go backwards and forwards and mess up time. Infact I would probably mess time up myself by letting some primitive man see my strobes and in the process he would lose all interest in fire.