Hillary wasn’t likable. The DNC is to blame for pushing an unlikable, unpopular candidate. They’d rather lose with Hillary, than win with Bernie, so that’s what they did. That is not new behavior for them. Plus trump resonated with a lot of fed up idiots, so he got votes. Thankfully he didn’t get enough votes the second time around.
It’s about as dangerous as using IE in the old days, or Edge in administrator mode.