The Mandate had nothing to do with occupying.
And they tried to lead 'Palestine' to independence, but the Arabs refused.
Not true.
Very true. The Arabs refused the partition offer. The offer which would have given them independence.
BTW, now the Palestinians are negotiating for less land then offered in the partition plan. I'm sure that plan is looking quite good right now.
Which is why they want to turn the clocks back to 1948 and evict the Jews from Jerusalem.