Final answer:
The author implies that if causes of factions cannot be removed, the alternative is to control the effects of factions through republican principles and institutional safeguards to protect against the negative impacts on society.
Step-by-step explanation:
In ruling out these possibilities, the author implies that if the causes of factions cannot be eliminated then the only alternative is to control the effects of such factions. This premise is based on the understanding that it is impossible to remove the sources of faction without destroying liberty or enforcing uniformity of opinion and interest, both of which are impractical or undesirable. Instead, we turn to manage the consequences factions have on society. The text suggests that since factions are innate to human nature and the variation of interests in society, the most effective approach to address factions in a democratic system is through institutional design and processes that regulate the impact of these factions, such as a republican government structure that can mitigate the effects of minority factions and guard against the tyranny of the majority.