How do i stop the propoganda mail?

i get a lot of newsletters from my synagogue about upcoming events and rallies. many of these rallies are very unjust and dont show both sides of the coin. i called my synagogue and asked them to stop sending me information about how all muslims are out to get me, and how i shouldnt talk to muslim people and to support israel blindly, but they keep sending these ignorant letters by post and email.

i want to have no part in the judgment of an entire population based on one group of people.

bonus question: my grandmother brings articles to the dinner table regarding the same things and every week there is a fight and every week, tears are shed at the table and theres screaming and shouting because of this. sometimes, hurtfull things are said to someone else that shouldnt be said or even thought of. how do i make her stop bringing up these judgemental topics?