Fatal importance of the third temple

Why The Third Temple should not be build? Before this, let’s look at who want to build the third temple? Since it is Jewish temple, Jews could be the one. Actually Jews want to build the third temple but according to the their scripture and religious law, they should wait King Messiah, at least a prophet to find some answers to build the third temple. What are the Jew’s problems? Holy Temple should only be build by Jews. But Holy Temple area is forbidden to Jews since they are ritually impure. Jews, who br