What's so bad about being Self-serving?

I hear lots of people criticize the Tories as being self-serving. So I ask myself what does this mean? Apparently it means doing something only to benefit one's self. Well most people do to some extent.
Many people do a good deed for something in return, or just to boost their own egos. I don't see masses of people helping the homeless, or even looking after their elderly relatives they pay others to do it, who only do it for the money.
Not that I'm religious but it does say in the bible God helps those who help them self. If you're not helping yourself then you are either a burden or burdening society.
I know some people are beyond the ability of helping themselves and plenty of people are paid to help them (and do a bad job) and there are a good number of volunteers too, but have you seen how much the volunteer section are crying out for volunteers? Nothing motivates people more than money, after all no one can live for free, even volunteers will be getting money from the benefits system, and if they didn't, they would have to give up the volunteering to get paid work, or at least for the time the need to work to make money to live. Hence Thatcher saying the good Samaritan was a rich Samaritan.
I would rather have politician who is self-serving running the country that one who is burdening the country. A politician that is self-serving isn't likely to fuck up the country because it's not in their best interests to do that.
I don't need people who know nothing about me thinking they know what's best for me. Apparently they are thinking of others when they organise all these work (house) schemes for us on benefits, but we haven't really got much in the choice of work, it's Labour's make a job in the ministry of daydreams, move that rock over there to here and we'll pay you for it. At least under the Tories you could choose what job you wanted and had a fair chance of working your way up, and making money. It's seems you can only get good jobs if you're a gay crippled midget, or a middle class woman (they are the easiest to brainwash).