I think it's silly as well. Adopting "transracially" will mean you have to open yourself to two cultures, but a responsible adoptive parent would do that anyway. It's hardly likely that if you come from a French background, so will your child. Maybe their ancestors were English, Dutch, or Italian!
Anyway, I have a funny story about this. I know a family here that adopted two daughters (they're biological half sisters by the way). The couple is "anglo" or "white" or whatever (Polish/German decent really - if you want to get picky). The older of the two girls is fully hispanic, and the younger is half hispanic. However, because the adoptive mother is very dark complected, other people almost NEVER believe that the full blood hispanic daughter is adopted. This has a good bit to do with facial structures, and other similarities, but it's funny. However, when the mother is out with both girls, or with only the biracial daughter, she is often asked if that girl is adopted.
Isn't that strange? I know that asking "is she adopted" is social taboo, but people still do ask it. Anyway, we've just always found it very funny that the daughter who SHOULD have caused them more trouble (if you don't agree with transracial adoption) never does, but the daughter who shares their race (at least half way) is the one who brings out the questions.