Israel was originally founded by a once nomadic tribe fathered by Abraham (the same forebear to the Arab peoples) that settled in the area thousands of years ago.
The current Israel was founded by the United Nations under the leadership of America, Britain, France, China, and the former Soviet Union. So yeah, it was founded by terrorists; just not Jewish ones.
The Jews are defending themselves from Palestinians, who are also defending themselves. Both have good claims to the land; and both are just trying to survive.
You want to blame someone, you've got the five countries that just dropped the Jews in the area without concern for either the Palestinians nor the Jews; then went on their merry way.