Nope, they're not and I didn't suggest they were. Evra being a good example of this.
When a player comes to this club there are certain expectations beyond those at other clubs. You have the basics, work hard, nurture your talent, thank the supporters, etc but as United fans we maintain additional expectations about players who join us and that is that they develop a connection to or understanding of our history and use that to form part of their motivation and identity. Generally, we aren't a fanbase that wants to see mercenaries whose only motivation is money and maybe trophies. Sure there are some fans like that but they are probably better off supporting a club like Real Madrid so as to avoid periods of disappointment like the one we're in the midst of now.