Nader didn’t hand the election to Bush. The Supreme Court did after they ordered Florida to stop their recount. Florida did finish their recount and Gore won, narrowly.
It goes against Democracy to suggest that one should cast their ballot for the supposed “liberal” Democratic candidate rather than for their preferred candidate all because of the supposed greater evil that is Donald Trump. One could argue that HRC is far more evil in that she’s, in one way or another, contributed to the evil things that Trump only talks about.
However, if you are scared of Donald Trump but want to vote 3rd party, you can use BurnMyVote.org to do so in a way that negates a Donald Trump vote or vice-versa.