It seems to me that the childish, impulse-challenged, or malevolent downvoters are unlikely to step forward and list their reasons. Methinks that you would hardly be satisfied by any reason they could give, e.g.
- Your post SUX0RZ
- You tree-huggers are all the same
- You fascists are all the same
- Your (sic) too big for your outlandishly large Nederlander britches
- I'm hungry
- My mother is very shrill
In conclusion, the truth behind downvoting is very likely banal and unsatisfying. I sympathize, but I don't think these pleas for answers will get anywhere with the people that offend you and others. Except to bring them glee as they see that their kicks have landed somewhere sensitive.