Pretty much this.
Think about it this way: Trump is highly disliked and distrusted by a significant amount of Americans, many of whom are in positions of power. Media, whether mainstream or not, will scrutinize his actions. If he makes moves that infringe on constitutional rights, they'll actually be reported on and become public knowledge, putting pressure on his administration to keep in check. Had Hillary won, the mainstream media would turn a blind eye to any questionable policies, and there would be little pressure to amend such policies (see: Obama administration).