Faith??

Some believe in god, and they say god looks after and cares for everyone and yet the only species I see flourishing is humans and rats.
My grand mom has unflinching faith in god and she has been going to temple regularly since, like, forever...and once we went to a temple on that hill top and it was a small temple with greenery all around and now that place is swarming up with people, littered with waste and construction going on in full force to accomodate even more followers...nature pleasantly gave way for the noble cause...
I am sensitive to any mis-doings by humans against animals or trees, so sensitive that whenever I hear anything related to this, I feel my mind blowing off...and so now-a-days I just don't give any head to such a news, assuming nothing happened and (guess I am not the only one)..and then we go to temple and say Oh! god bless us all...
And one fine day I thought of going through our histroy, our sacred litrature Mahabharata and hey there it was, that part, that only sentence which still confounds/confuses me..."and Pandavas burned down an entire forest to build their new city"...and all that time they had the blessings and well wishes from Lord Krishna and not to forget how just and kind Pandavas were in there own nature!!! So does that sacred text justifies whatever we do with our environment??
Well whatever maybe the answer, I feel faith is what you derive from such writings, many take it as the victory of good over evil and I am still thinking who is more evil.... :)