This drives me nuts! I don't know why I should be motivated by YOUR mission! Especially when your mission is to make as much money as possible in an easily exploited niche you found!
Not all companies are the same. Sure, all companies exist to make money for shareholders, but some companies make cigarettes while other companies make life saving drugs. So, yes, it does make sense to take the company's mission into account when deciding whether to work there or not
Companies that make life saving drugs aren't usually short on money.
If a company made a life saving drug and then released the patent say after 5 years of exploitation, I'd agree with the argument as well.