But the similarity of feature (right down to molecular biological similarities) are the evidence that the conclusions are drawn from.
How could you have a problem with that?
The image of the two closely related primates you posted as a refutation of the two closely related (both in the Therapoda clade) show such similarities that the only reason one would not conclude a relationship is theological.
What would make you think that a human and a chimp are not closely related (please don't forget endogenous retroviral markers)?