Why do independents who didn’t vote, who acknowledged how unpresidential Trump was, think they didn’t directly help elect him by not voting?

The same rough amount of MAGA goes for him every election. It’s those who voted for Biden who didn’t vote for her who allowed Trump to get in office.Why did the DNC have to put forward a ideal, candidate to win you over, when you knew whatever the DNC puts out, the alternate was Donald Trump, a psychopathic malignant narcissistic who is a 34 count convicted felon, career fraudster, pedophile rapist who caused a violent insurrection?