On the other hand, Nixon’s bombing of Cambodia also help end the Vietnam War saving thousands of American lives. Nixon bombed Cambodia because the North Vietnamese and the Viet Cong had been using Cambodia as a “safe zone” where they would flee to recover and rearm knowing that the Americans wouldn’t bomb them there (and even attack American and South Vietnamese Troops from Cambodian soil). The Americans bombed the North Vietnamese that were in Cambodia, not the entire country. The lack of Cambodian safe zone and the bombing of Ho Chi Mihn City helped bring North Vietnam to the negotiating table to sign the Paris Peace Accords in early 1973.
To say that the bombing of Cambodia “led to the rise of Khmer Rouge” is historical speculation. Khmer Rouge pre-existed the bombing and received direct help from the North Vietnamese in overthrowing the government. Arguably, the opposite is true. If Nixon hadn’t been under investigation because of Watergate and hadn’t been frustrated by Congress with the Case-Church amendment, Nixon would have prevented Khmer Rouge from taking Cambodia. There is simply no way to know one way or the other.
While Nixon certainly had some classic Anti-semitic prejudices, he also saved the state of Israel and millions of Jewish lives by re-arming the Israeli Defense Forces in the middle of the Yom Kippur War.