Or we try to. Most of the time I suspect these good motivations are a cloak for fame, money, power, sex and influence. Which is why it might make sense to build a strategy upon a sin (sorry church-goers).
Here's a list; Lust, gluttony, greed, sloth, wrath, envy, pride. If someone's pride at stake, you can bet they'll join you're community.
If you think this is inherently bad, remember how many marketing strategies are built upon envy, greed and lust. Even better, consider how many good causes are built upon wrath? Save the _______, environmental Groups, even top 10 charities