why do you consider it evil? it seems like a great way to reach back out to someone who was potentially interested in your service. if all retargeting is doing is showing you ads from a website you already visited. How is that evil? Are babies dead because of it? Or perhaps do you remember that you like that website and eventually signup because you got the extra reminder... that is just called advertising and it's what powers/pays for most of the free web... not a big deal really... the minority can and does block these ads big deal..
If walked into my office to browse or came into my retail store to browse I think you are it might be interested - but really this is the Internet so it's neither a stalker or an brick and mortor store... You can choose to block third party cookies - If we make them off by default you lose that choice
