Why is it that people who are not adopted answer questions?

Okay, I so don't get it. Why would someone answer a question that relates to adoption and in no way shape or form they are involved in adoption. Just because they know of people that are adopted, they know how we should feel. I'm so sick of seeing that "your bio-mom gave you up, why would you look for them" Why would you love someone that gave you up" Searching for our biological families mean we are being disrespectful to our adoptive parents. I mean how would you know. All three suggestions i can prove wrong, most people on here will say that they have found out that their moms were forced to give up them, by their grandparents. in my case yes my mom was a drug addict, but my bio family was not, therefore i searched for them and found them. my adoptive parents never once felt that i disrespected them, in fact they fully supported me. ---so why is it that people who are not adopted, slew this hate around and tell me how i should feel as an adoptee?