Why do non adoptees always feel they have to put their two cents in about adoptees being unhappy or angry?

I am new to this site and I have been reading alot of questions and answers about adoptees, or how they feel, or why are they so angry...etc.. And in every single one there are at least 4 or 5 non adoptees putting in their two cents ! I must admit , this really makes me angry! If your not an adoptee or married to one , you have no right even weighing in on this issue!!! you have no idea now nor will you ever what its like to walk a mile in our shoes! I would like to know what adoptees think when they hear non adoptees say "just get over it" or " boo hoo for you" ?