Why Is Israel Helping Hamas?

I've read several articles about how Israel is going to withhold tax payments and customs revenues when the Hamas group assumes control of the Palestinian goverment. I think this is just going to strengthen Hamas and their support among Palestinians.

The strength of Hamas among Palestinians is derived from three sources: their armed strikes against Israel, their reputation of being relatively incorruptible, and their vast network of charity hospitals, orphanages and schools.

Look at where Hamas is strongest - the poverty-stricken refugee camps of Gaza. In these areas, people depend almost entirely on Hamas for safety, security and their personal welfare. Hamas educates their children, takes care of the sick and the elderly and provides the only social stability in the squalid camps.

When Israel freezes millions of dollars in Palestinian revenue, it's only going to harden the common people's attitudes further against Israeli society. It also gives Hamas a perfect excuse for when their government fails to improve the lot of the Palestinians. Finally, it makes them even more dependent on Hamas for their social services, employment and safety.