You always believe sources that deliver "information" that corresponds to your views. Why wouldn't you assume they are all true?
You always reject sources that deliver "information" that is antithetical to your position. Why wouldn't you assume they are all false?
What if you are dead wrong on both counts? Are you better off finding that out or better off not knowing so that you can keep on keeping on believing what you have always believed because it's how you were raised and what you were taught to believe? I dunno if you prefer being upset and disillusioned by learning that what you believe and what is true are not the same thing or prefer living in your ideal thornless plastic fragrance-free rose garden forever after?