I assume you support enforcing vagrancy laws then and removing vagrants from public spaces? Because vagrants defecating in public and leaving used drug needles and other filth lying around certainly is a matter of public health[1][2].

[1] https://www.cnn.com/2017/09/14/health/hepatitis-a-outbreak-s...

[2] https://www.nbclosangeles.com/news/local/Typhus-Epidemic-Wor...