I have endeavoured to give to them their full force?

Does "I have endeavoured to give to them their full force" refer to "I've work hard to let the objections (them) to show their full force/to rigorously, completely, freely express their opinions"?

Context:

As this whole volume is one long argument, it may be convenient
to the reader to have the leading facts and inferences briefly
recapitulated.
That many and serious objections may be advanced against the
theory of descent with modification through variation and natural
selection, I do not deny. I have endeavoured to give to them their
full force. Nothing at first can appear more difficult to believe than
that the more complex organs and instincts have been perfected,
not by means superior to, though analogous with, human reason,
but by the accumulation of innumerable slight variations, each
good for the individual possessor. Nevertheless, this difficulty,
though appearing to our imagination insuperably great, cannot be
considered real if we admit the following propositions, namely,
that all parts of the organisation and instincts offer, at least
individual differences--that there is a struggle for existence
leading to the preservation of profitable deviations of structure or
instinct--and, lastly, that gradations in the state of perfection of
each organ may have existed, each good of its kind. The truth of
these propositions cannot, I think, be disputed.

- Charles Dawin