What's the effect of association with outcasts?

Even if out of "compassion", what's the effect of association with [outcasts](http://zugangzureinsicht.org/html/tipitaka/kn/snp/snp.1.07.piya_en.html) , even appear as "family-member" of such? What's the effect of being related to those who are actually turned over the bowl? Associate with thieves, slander, people who speak in dispraise of Buddha, Dhamma, Sangha, gratitude, generosity, virtue... those who use generosity to offend the giver... with no regard for hospitality, training, teacher, faith... Do they risk to be avoided likewise by the wise and good? How are people adviced to act in regard of outcasts? To bear such, or to avoid any association or ways that look like as if? *(Note: this is not given for trade, exchange, stacks and entertaining but as a tiny door to exit this wheel)*