Do You Hold Grudges...

...when deciding when or how to answer posts?

There have been several times where someone posts a request to, let's say, solve a website problem which I may know how to fix.

After answering though, I remember that this guy was the one asking about how to spam 1,000,000 people or this was the person that was rude, and disrespectful the last time I tried to help or this user is the one not giving promised refunds or whatever.

I'm torn on this a little bit and wanted your feedback.

1. I believe most people have helpful contributions they can make. Even newbies can help out if they speak from experience (not necessarily MMO).

2. I despise being associated with or helping scammers, rude people, etc. even by helping by answering a post.

3. I believe people can change - I have and am always trying to be better so I try to give the benefit of the doubt in most cases.

Even though I've thought about this a long time it came to a head this morning when I answered a post basically defending the OP's plan then I realized he was someone a week or so ago that made some errors. I believe he was spamming the forum with the name of a well known guru among other things. Do those past indiscretions make this post today totally worthless, sig whoring, spam?

Your thoughts?

Mark