Huh? Many folks oppose Trump. The networks, the media talking heads, the system in general. Obama never dealt with the amount heat thrown at Trump. To some folks, that lends credence to the guy, IMO. You're seeing a similar thing with Bernie. Claims of DNC corruption. The whole "outsider" angle.
IMO, the political climate, or perceived political climate, has never been so anti-system as it is now. Folks are sick of D and R. They're sick of shutdowns, real and imaginary. The political counterculture is what's driving both of those candidates.
As an aside, I am convinced a hefty number of Trump supporters (not voters mind you, but folks who support him on media platforms) are doing it partly out of combined spite and cynicism. Let's vote for the crazy celebrity because !@#$ it. They aren't supporting an actual candidate, but a government suicide. It's no coincidence that the loons in the dark corners of the internet like 4chan are full of Trump propaganda.