If they agree that Trump/Republicans are fascist, ask them why they think it's an acceptable risk to allow the government to construct the most pervasive and advanced surveillance state that has ever existed for fascism — a system so advanced it would make Himmler cream his pants — why build big brother so all they have to do is simply take over, turn a key, and use it against the world?

If they're insane and think Trump/Republicans are the good guys, repeat the above but swap out the perpetrator for liberals/trans/immigrants, or whatever "other" is the flavor of the week.

If they're not American, ask them what they think will happen if the world's strongest ever superpower — a kleptocratic failed state, straddling the knifes edge of fascism — with a secret police who have backdoor access to the tracking device in their pocket, all their data, and all their historic communications — became a fascist dictatorship? ... Point out how "woke" they are (sex before marriage, gay marriage, whatever) ... and ask them how comfortable they would be if the tens of thousands of people working at the NSA/CIA were converted into fascist "troll farms", and started using AI and analytics of all their personal data, to unilaterally wage a cyber war on everyone they deem "woke"? Do they think their government or military could defend them from a bad actor that has the ability to hack anyone on Earth... A bad actor who, if they want you out of the picture, just has to remote into your machine, download some child porn, and tip off the local police... Good luck trying to prove your innocence. You don't even know what most of those words mean! You weren't even aware that this was a possibility 30 seconds ago!