I disagree with your assessment of the article.
It is not even close to saying anyone should give Trump "a fair go".
It is saying that there are an enormous amount of moderates who could be swayed away from Trump with a rational and thoughtful discussion, but are instead belittled and vilified.
There has been 2 years of rational and thoughtful discussion. It hasn't worked.
The Democrats need to get gloves off and target very hard:
1) Trump's administration is corrupt - rotten to the core. Remind the electorate mercilessly of every aspect to this.
2) Vote. Fewer than 30% of eligible voters put Trump in power. Remind the electorate how a racist campaign designed to deter black voters was put in place to great effect by people at the very top of the Trump 2016 campaign.
If that offends "moderate" Trumpists - too bad.