It's more than annoying when said people proceed to summarily exterminate and/or expel all members of the democratically elected government belonging to the rival party, and bring about a quasi-religious violent regime which kills its own people for ideological ends.
Also, it is not ok to use your own civilian population as human shields, raise a generation of kids to become violent martyrs for your cause, and sacrifice their lives for your ideological war, which include things like the "elimination of a Jewish state in Israel".
Hamas killing Palestinians living in Gaza who are having a wedding, which wasn't Islamic enough: https://www.youtube.com/watch?v=vEud-cEjwQU
Indoctrinating children to hate and "kill Jews" to "liberate Palestine":
http://en.wikipedia.org/wiki/Tomorrow's_Pioneers
By the way, in Hamas' view, "liberate Palestine" means to rid it of a Jewish state completely. If they took all that money to actually improve the education and quality of life of their citizens (which is what they are, essentially), they could be a legitimate government of a legitimate state. They already effectively have a state in the Gaza Strip. But their leaders would prefer to fight their ideological war and sacrifice their own people for it. As often is the case, it's the leaders of the people with their ideological ideas who are most responsible for the deaths of their own population.