Why did Tiberius grace his propose land reforms in 133 BCE?

Tiberius Gracchus wanted to effect a distribution of farm land to the landless poor. Many poor peasants had lost their land because they had fallen on hard times and the owners of the large and expanding landed estates had taken advantage of this to buy land of the cheap. Moreover, these landlords were in the habit of also encroaching on public land. Traditionally, the Roman state gave people plots of land which were just allotments. The bulk of the land was public land. However, the rich appropriated much of this land. Al law limiting the amount of land anyone could own had been introduced some 230 years earlier, but had proved ineffective. Tiberius saw giving plots of public land to the poor as a means to relieve poverty. However, this was bitterly opposed by the aristocracy and Tiberius and some 300 of his supporters were clubbed to death.