This week, terrorists struck two locations in Tehran, Iran. Donald Trump said he was sympathetic to the victims of the attack, and then turned around and accused Iran of having complicity in the attacks on their own country. He said:
"We underscore that states that sponsor terrorism risk falling victim to the evil they promote."
Understandably, the Iranians were upset with Trump. His statement infers that Iran supports the group that attacked Tehran (ISIS). It's just a continuation of his claims that Iran supports the terrorists that are attacking Western nations. None of that is true.
Iran does offer support to a couple of groups defined as terrorists -- the Houthi in Yemen and Hezbollah in Lebanon (and Palestine). Those are shiite muslim groups, and Iran is a shiite muslim state. But those are not the groups that attacked Iran, and they are not the groups responsible for attacks in Europe and the United States.
The groups mainly responsible for attacking Europe and the United States are sunni muslim groups -- ISIS and al-Queda. They get no support from Iran. Their support comes mainly from a country that Trump calls a "friend" -- Saudi Arabia. Saudi Arabia is a hotbed of wahhabism (the extreme fundamentalist sect of sunni muslim thought that gave rise to the sunni terrorists like al-Queda and ISIS), and Saudi money has gone to both these terrorist groups.
Trump seems to want to lump all islamic fundamentalists into a single group of terrorists that hate the West. That is far too simple. It shows he is either lying and misleading Americans, or he doesn't understand the truth -- that the trouble in the Middle East is basically a religious civil war being fought between shiite and sunni muslims. He seems to have sided with the sunnis without understanding that they are where ISIS and al-Queda have originated. He also seems not to understand that ISIS was created when an American president (Bush) overthrew the secular government in Iraq and installed a shiite muslim government in its place (which caused sunnis to rebel against that government and the shiite government in Syria by creating ISIS).
Blaming Iran for terrorism in the West is ignoring the reality of what is happening. It would make more sense to blame Saudi Arabia. But Trump doesn't want to do that, because they have too much oil that we want and have plenty of money to spend on U.S. weapons. In effect, Trump has taken the side of the sunnis in the religious civil war -- the same side that is attacking the Western nations.