If only 45% voted for Trump, they wouldn't have valid opinions? If 5% made the difference, then 90% of the votes for Trump don't form a mandate? There's a prob

If only 45% voted for Trump, they wouldn't have valid opinions? If 5% made the difference, then 90% of the votes for Trump don't form a mandate? There's a problem here - first past the post voting - but there's also another problem: denial of the legitimacy of an opposition. The vast majority of the people who voted for Trump have valid opinions. You can't just dismiss them.