Here is an excellent example of the "both sides do it" fallacy.
Trump and the Republicans have officially no platform. No proposed solutions for what to do to make America great again (needed now more that four years ago, that's for sure).
Take a look at Biden's website and platform - there are so many explicit proposals for fixing America's problems that I couldn't read them all. And none of them involve villifying, or doing anything nasty to "the other side".
“You never change things by fighting the existing reality.
To change something, build a new model that makes the old model obsolete.”
– R. Buckminster Fuller