They wanted the Patriots because they might work.
The Poles are not dumb. The “Missile Defense” Star Wars Part Deux big money depended on a fantasy of Iranian ICBMs to hit UK or USA with Iranian warheads. The Russians pointed out that Iran had no such weapons, it must “logically” be meant against Russia, but they could easily knock out the radar in Czechia rendering the boondoggle even more worthless.
The Russians know this, their recent temper tantrum is from lack of control, that Poland won’t follow it’s dictates.
The Iranian Shahab-3 has a range of 2,000 kilometers & is classed as a "medium-range" ballistic missile. The Shahab-4 is expected to have the characteristics of an "intermediate-range" ballistic missile, if it ever gets built. That would bring most of Europe into range. This week's announcement that Iran was going to launch its first domestically-built satellite may indicate that they have completed the -4.