Say it's the 18 century with slavery is common. The slave owners are depriving the slaves of liberty and happiness. But the deprivation of the slaves liberty brings the owners happiness.
If you cannot persuade the owners to stop depriving slaves of liberty, then there two options remain.
One, you respect the owners right to happiness. But at the expense of the slave's liberty.
Two, you use force to stop the owners from violating the slaves rights. But in doing so you violate the owners right to happiness.
What's the answer then here if there no options that do not harm someone's unalienable rights?