I don't like either candidate for president, but I think there are people who are unaware of Trump's history.
For example,
"Trump's positive comments about Clinton date back many
decades. He praised her candidacy for president in the lead-up to the 2008 election, though he also supported Rudy Giuliani for the Republican ticket. According to a 2008 Politico report, Trump also
donated to Clinton's campaign during that year's primaries." from snopes.com.
Trump has also declared corporate bankruptcy more than once.
Personally, I believe he's a narcissist who has learned to manipulate the extreme right conservatives.