Except the people on here aren't doing it willy nilly. We're not throwing out the words Genocide or Nazi due to any one specific case, we're looking at the whole picture and basing it on a sum of numerous examples. In fact, very few times has anyone on here actually said "Trump/MAGA is/are Nazis", rather we've said they are fascists, and compared specific individuals to specific Nazis.
So what is the percentage likelihood that in the next three-and-a-bit years the administration is going to designate one or more classes of individuals as undesirables, confiscate their property, round them up and put them into camps (for indefinite detention), and start executing them? I claim zero, even without the executions.
Keep in mind all the horrors of deportation policies are a consequence of setting the (impractical) goal of deporting more than a few thousand people of the people in the country illegally, which is a consequence of enforcement failures (or negligence) by prior administrations. I expected it to be messy, and it is. That doesn't nullify the legitimate goal of enforcing immigration law. Cushy "Club Fed" type detention centres aren't going to be constructed to serve a temporary need. It isn't even a little bit "approximately" like concentration camps.
With respect to mere fascism, what is the percentage likelihood that in the next three-and-a-bit years any of the following will happen: the Democratic party will be outlawed; Antifa and No Kings and other anti-government protestors will be attacked without restraint in the streets by police and army and disappear by the dozens or more into detention; the judiciary from top to bottom will be completely obedient to administration dictates; the military leadership will exhibit unquestioning obedience to manifestly unconstitutional or otherwise illegal orders; corporations will essentially cease to compete in meaningful terms and become state-guided; media and entertainment luminaries will essentially cease to criticize government; Congress will cease to pass any legislation but what the president requests?
Pretty much none of that is going to happen - because people are already on the lookout for it, and because no-one with the power and appetite and motivation to pursue it is actually in government.
If you want to worry about fascism, worry about progressives. They're the ones with plans to pack courts and force-retire inconvenient judges, who want social media to comply with their "information management" requests, who have talked about imprisoning people for absurd things like "climate denial" and who set the tone for whatever "cancel culture" is, who are comfortable nationalizing anything that isn't doing what they would prefer it to.