People differ in how they view what is morally right.

Illegal immigration for example.

Some may say it's immoral to not allow illegal immigration, those people are just searching for a better life.

Others point out that by looking past that you allow the exploitation of workers, the estrangement of families, and of course the horrors of the coyotes that rape, extort, and enslave those people.

Another one is crime reform (ie, releasing prisoners, no cash bail). Those who support it believe they are being compassionate of prisoners while often missing the compassion for the victims those criminals hurt and incentivizing further crime.

Sometimes one is so tunnel visioned in their moral argument, they cannot see that choice causes harm to others, often greater harm.