In regard to the racists or drug dealers etc ^ sometimes its better to go with protection, like it may be better for guys to go to them if there is danger that the person will get attacked.

I've also heard in lectures that when doing dawah, going in groups [maybe pairs?] is better than going alone. Since if you fall [physically or even say something wrong by mistake - that companion can protect you/correct you etc.]


About giving dawah in the neigbourhood, you could start off with treating neighbours with respect, kindness etc [obviously with non mahrams it can be dangerous so thats better to avoid] - then it could lead to talking abit, then a little bit of dawah can start off from there because the trust is settled now.


Here's a good thread where we explained what's good to discuss in dawah:
http://www.islamicboard.com/campaign...ips-ideas.html


Also - guidance is in the Hands of Allaah azawajal, so we need to pray to Him for their guidance and convey the message clearly with wisdom.