Theft is theft.
It does not matter if it is a paper clip. If I steal a paper clip and get away with it, I am more inclined to steal a stapler tommorrow.
The murder analogy is extreme and sounds that way because so many steps were left out on the road between thinking it is ok to steal paint and thinking it is ok to take a life. Also, a life is unique, and only the cheapest paintballs are each unique.
The fact is, stealing paint is one step down a road that starts with stealing paper clips and a grape from the grocer and doesn't end until genocide or mass murder of some sort. There are many steps between, but the path of evil is the same. Somewhere along that path is stealling your new Angel. Somewhere else is stealing paint.
We who don't want bad things to happen cannot afford to say, "well, it is bad, but not that bad." Is it evil or not? If so, the only choice is do you tolerate evil or not.