Yes, I agree.
While I definitely cannot presume to second-guess the Kerchers' thought processes - and I also definitely cannot put myself in their shoes - I suspect that a reasonable possibility is that they put their faith and trust in the prosecutors and their own lawyer. When both these parties told them unequivocally that Knox, Sollecito and Guede acted in concert to assault and kill Meredith, and when that version of events was endorsed by the Massei court, I suspect that the three-perpetrator "truth" might have become deeply embedded in their consciousnesses.
If that was the case, then the subsequent reversal by Hellmann's court, followed by the SC ruling, can only have served to set off cognitive dissonance. Again, if that was the case, then I suspect that the easiest path to resolution of this dissonance was to revert to the original embedded "truth", and to decide that everything contrary to this "truth" was either incorrect or mendaciously partisan to Knox and Sollecito.
If and when Knox and Sollecito are finally cleared of any involvement in this crime, I truly hope that the Kerchers can ultimately find peace and comfort in the outcome, and some small crumb of relief that the correct perpetrator - Rudy Guede - was at least caught and brought to justice. I hope that Maresca will waive some or all of his fees too, but I fear that may be a forlorn hope.....