Are you talking about the 40 years of 'death to America, death to Israel' calls from the Islamic Republican of Iran? The same regime that bragged 'we defeated/destroyed Persian culture/civilization' when they took over Iran?
Iran's prior government was a US-supported monarchy and torture regime, with Israel also credibly accused of state-sanctioned ethnic cleansing, rape and torture. Arab resentment of American and Israeli occupation is justified much in the same way as the occupied Raj demanding death to Britain.
What does that have to do with the Islamic Republic's bragging of conquering/ending Persian civilization in the name of Islam? A group should not celebrate conquering/ending a civilization. Especially so called religious leaders.
Iran is not Arab and is not occupied by Israel.
In your second statement you seem to callout the behavior, yet you defend it in the first? Calling for the death of random societal/structural groups, be that entire countries/societies, ethnic group, etc, is unacceptable behavior. It is especially unacceptable when it is done by powerful political leaders. It is outright evil when it is done by religious leaders.
Yet the Islamic Republic of Iran is the only one of those nations that bragged about erasing an entire civilization when they celebrated that they had 'defeated/destroyed Persian civilization' when they took over Iran. In their minds they have ALREADY done this once.