If it were at some other point in time, I would agree with that. However, the Republicans that he beat out for the nomination weren't an easy crowd and he made it through that. You're left with Clinton, who is extremely corrupt and it's almost scary what she might be willing to do as president. You can say Trump is radical, yet he's met with the GOP and actually worked on things with them. You also have to understand that to get thing through congress has to be involved. Who would you be more worried about in that case...and extremely corrupt career politician or someone who was praise as being extremely easy to negotiate with (before this election)?
Both sides are extremely radical. It just shows how disgruntled the people are with how things have been run in the past few years. When things get to that point, anyone really has a chance.