While I do agree with you that we do suffer from influx of foreigners in Qatar. Still, I think the main reason for the locals increased feeling of resentment is due to the fact that they claim we don't have enough privileges like before !In addition, to deficiencies in health and education services because of population density
Expatriates presence is essential for the development process. There is shortage of qualified qatari employees, qatarization program have created a whole generation of clerk jobs for young college drop out qataris who prefers to be recruited for entry level jobs than to go for higher education
Just do a little search in ql, you'll find answers to all your questions. This have been discussed here many times before.