I am going to say that for the most part the kindest entrepreneurs are the ones who believe in you. I know this answer is strange, but here is why.

I have very little time to help people and less time to help people for free. That means that I must be very choosy in where I devote time and attention (paid or unpaid). Therefore, I appear more kind to those I believe in, because I devote more energy to them. That said, they need to respond by spending the effort and attention to move their projects forward.

As you can see, the reason I answered the question as I did, is because kindness will in large part be a reflection of you and your actions. It is easy for Dan to list kind entrepreneurs; I know Dan. He is driven and does his homework. Entrepreneurs will believe in him and they are interested in his project, will generally treat him kindly. Be that way, and you will find more kindness than you ever expected.