You can't be sent back if there's a legitimate threat to your life waiting for you. Like being a woman in bad standing with her family, or being gay. It happens anyway sometimes of course, and people do lie sometimes. Although I have a hard time seeing a devout Muslim being in a committed gay relationship just for a visa/citizenship.
Personally I dislike the influx of religious cultists, since we've worked really hard for the last 50-70 years to free ourselves from the oppression and violence that the sick Cult of Yahweh has brought us throughout history.
That's the thing though. We do care for suicidal people in this society. We should care even if they're killing themselves slowly. It's not a choice they're making. It's literally mental illness.