Did I sin for ignoring and not help them or not?
Did I break the Jesus' commandment to love your neighbors as yourself?
Well for some reason I dont believe this actually happened to you, it may have if so forgive my skepticism, its just that I see you create many many threads most trying to subvert Christianity in a backdoor way, and then never really comment again. So yeah I doubt you saw a man and ignored him.
Regardless to the question at hand, if you are really caring to know about how the Word of God speaks concerning this:
James 2:15 If a brother or sister be naked, and destitute of daily food,
16 And one of you say unto them, Depart in peace, be ye warmed and filled; notwithstanding ye give them not those things which are needful to the body; what doth it profit?
I believe we ought to help those in need, do I go to every single homeless person I see, no, but if I am given the opportunity to help I am happy to help. What I do not do is give money, I do not care how badly they say they need it, I refuse to give money ever.
In the times I have helped those begging, what I have done is come with food, then try and talk to them to know them a little bit. If they tell me of other things they may need, then I offer to get it for them. I speak with them try and be friend them, treat them like humans who just need love, need friendship, need someone to talk to. Usually they open up and tell me quite a bit about themselves and how they ended up in the situation they are in. In the neighborhood I used to live in there were quite a few homeless people in the area, and I simply brought them food, offered them friendship and prayed over them if they would let me. I gave some clothes and offered to take them to Church. Now I know them as people and they know me, if I see them again on the streets I talk to them and if I am in a position to help then Lord Willing I will try and help...
I believe this is what Christ is asking of us, not just to give them money and walk away, what Good is that truly going to profit them? Most of the homeless people I have ran into are either drug addicts or alcoholics, I am surely not about to give them money so they can waste it on more drugs or alcohol. Why should I help to support their addictions? I dont beleive Christ would want us to do such a thing. Instead speak to them find out about them show them love and compassion offer them food and clothing and whatever else one can while speaking with them. Money is usually the last thing someone on the street truly needs...