cause his racist and hated jews
The Jews were the target of Hitler's hate campaign.
Because they were an easy target. Historically Jews had been blamed for all manner of evils, as a minority religion they had no great voice in any government.
they included jehovas witnesses, communists, jews,homosexuals, and gypsies. also, his primary target was gypsies.
Yes. To read about why, please see the Related Question below.
so it was easy to kill them all
It's called comedy, and Jews are an easy group to target for that style of it.
Hitler did not really convert Germans to hate the Jews. Germany was already an anti-Semetic society when Hitler came to power and therefore, it was easy for Hitler to convince Germans to go along with his plans for Jews.
because they had no statesman to speak up for them.
easy killing a whole bunch of Jews
Hitler thought of Jews as vermin.
For many reasons. He was an enemy to the Jews like Haman in the Bible: Because Haman the son of Hammedatha, the Agagite, the enemy of all the Jews, had devised against the Jews to destroy them, and had cast Pur, that is, the lot, to consume them, and to destroy them; (Esther 9.24) If you want a historical answer, it is that Hitler needed a scapegoat for Germany's problems after WWI, and the Jews made an ideal target. They had access to almost all of Germany's economy, since Jew's are known for their skill in finance, and, as the post WWI German economy was in ruin, and the people wanted something to blame, Hitler made an easy connection. Also, Hitler was slightly imbalanced, and, after trying his hand at art, and having his style criticized by a few Jews, developed a sort of "artist's vendetta."
He was involved with Hitler so he for sure targeted Jews. There are probably more but that is the only one I know.