I agree with the general sentiment and indeed do everything you suggest. Based on my experience 99% of the time this is the right approach but there is a small

I agree with the general sentiment and indeed do everything you suggest. Based on my experience 99% of the time this is the right approach but there is a small minority of people who are severely damaged. I live in London, UK and despite being polite I've had homeless people be aggressive to me, loud swearing and yelling, but nothing physical so far. Also there was a recent story where a kind woman tried to help a homeless person and invited him to live in her home and tragically he ended up murdering her, her son, and almost the husband (http://www.bbc.co.uk/news/uk-41484206 http://www.bbc.co.uk/news/uk-41484206). Obviously that particular incident is extremely rare but the point, yes everyone is a human, yes everyone should be treated with respect but be cautious, it's impossible to know how damaged and ill someone might be and I think it's best to keep interactions to a minimum but be polite.