Why can't trump supporters admit he lost the 2020 elections, why do they keep repeating the same big lie?

they know he lost the 2020 elections but instead of admitting that they lost, they either partially concede or they go on about potential voter fraud, oh and I don't care about what hillary did in the past, I am talking about trump.

Why can't trump supporters admit he lost the 2020 elections, why do they keep repeating the same big lie?
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