How should one deal with the mentally incapacitated or homeless people with worn-out clothes and dirty bodies if they enter the mosque?

Answer Summary:

The clothes of the mentally incapacitated and those who do not guard themselves against impurities are usually impure. However, due to the difficulty of guarding against them when interacting with them, Islamic law has removed the burden and considered their clothes pure, prioritizing the rare over the common, as mentioned by Al-Qarafi in "Anwar Al-Burooq." He considered this a kindness from the Lawgiver to His servants, and that their clothes are deemed pure to alleviate hardship for those who interact with them.