When someone really really wants to believe something, he'll say it over and over hoping someone will agree with him, or that someone who doesn't know what's what will believe it and begin repeating it himself. I call this 'repeating a lie until it becomes true'.
There's no better example of this than 2nd Amendment people. Their arguments consist mostly of just repeating the same 'slogans' they've been repeating for years now, slogans that have long been known to be false. One of those is 'More guns make us safer'. It's NEVER been shown to be true, in fact the actual evidence is mostly on the other side--the more guns, the more gun crimes and gun violence. But they WANT it to be true so desperately that they repeat it over and over hoping people will believe it.
About a decade ago I heard that guns had -prevented- over one million crimes in the previous year. I heard this dozens of times because every gun-lover repeated it over and over. I wondered how you'd know how many crimes had been prevented by guns. Did they mean that someone tried to do a robbery or burglary and someone pulled out a gun and the would-be robber ran away? Did that happen a million times in a year? Did it mean that armed homeowners shot one million perps coming in the window that year? Or did it mean that people walked down the street with concealed-carry firearms and WEREN'T robbed. I mean yeah, that must happen a lot! I've never heard a decent explanation of that statistic, and I haven't heard it in maybe 10 years either. My guess is that it was just made up.