Instead, he stepped aside (for whatever backdoor promises that were made) to allow Hillary Clinton to make her historically terrible run for the office. Clinton was the epitome of the corruption at the Capitol, and her nomination (and tactics behind "earning" that nomination) were just more fuel to add to the fire that would see Trump sent to the White House. Worse, it was her campaign strategies that boosted Trump to winning the Republican nomination in the first place. Allow me to explain.
The 2016 field of Democratic candidates had a number of viable challengers. Biden's announcement that he would not seek the office (which was a bit of a surprise, but a relief to those of us who remembered his many gaffes as both Senator and Vice President) made it so that Hillary Clinton was the most politically experienced candidate in the field--with the exception of the radical Bernie Sanders. Unfortunately, Clinton was surrounded with legitimate corruption issues (and I'm not talking about the false-flags of Benghazi or her emails). In particular, she had been neck deep in Savings and Loan scandals, "healthcare" shenanigans, and iffy campaign contributions. Then there were the backdoor deals that lifted her as a contender. I was personally furious for the NEA's (teacher's union) endorsement of her (especially over Bernie Sanders) prior to the Democratic National Convention considering that, as a Senator, she voted for the No Child Left Behind Act and later for the Every Student Succeeds Act (both of which sound great but actually gutted funding for public education by placing unrealistic and unfunded federal mandates in place). I was told that the NEA was looking for a more electable candidate, but that kind of garbage line was the frustration that people were having with politics. Also, we see how well that turned out.
Her campaign then started its fateful tactic of using campaign funds to discredit Donald Trump's Republican competitors. These smear campaigns were so effective that Jeb Bush (who had been the presumptive Republican nominee) and others dropped out of the race. The DNC's conviction was that no one in their right mind would let Trump take office, making his nomination Clinton's best chance at having her own desk in the Oval Office. Her campaign helped spread misinformation that would solidify Trump's base and lead to his rise to power--which has been the "gift" that just keeps on ... well ... destroying the fabric of America.
In doing so, she alienated independent voters, provided a lightning-rod candidate for the Republican Party, and failed to rally Democratic voters to her side, losing the electoral vote by especially insulting rural Americans with multiple poor-worded phrases when she realized that people were seriously voting for the man who would become the worst President in history. In hindsight, the outcome was almost obvious. Her campaign highlighted the corruption behind her candidacy, spread misinformation that empowered a terrible candidate, and alienated Americans who were tired of that sort of politics. Thus, Joe Biden, by stepping aside in the 2016 election, directly contributed to the devastation that Trump's Presidency brought to our nation.