Indeed. In my opinion, it's disingenuous at best, and morally repugnant at worst, to create this sort of false dichotomy in which a belief that Knox/Sollecito should be acquitted is automatically incompatible with empathy/sympathy for Kercher's family and friends.
To me, one of the (many) horrible aspects of this sorry case is the way in which the Kercher family appears to have been guided in their beliefs by the Perugia authorities. It's very easy to see how a grieving, confused family could become entranced by the apparent authority of people such as Mignini, Comodi, Giobbi, Massei and Nencini, reinforced by the (false) automatic belief that such authority figures are disinterested, morally-upright individuals who have no agenda other than "solving the crime".
I very much hope that if/when this whole thing unravels, the friends and family of the victim will - perhaps not immediately but in time - come to understand and accept two crucial things: 1) there never was any credible, reliable evidence of Knox's/Sollecito's participation in the murder, and 2) all the reliable, credible evidence is wholly consistent with Guede acting alone. But of course none of that will ameliorate the unnecessary years of uncertainty, cognitive dissonance and financial penalty that the Kerchers will have gone through as a direct result of the incompetence and misconduct of various individuals in Perugia law enforcement and the Italian courts.