The left wants to include all of the traditionally divided groups on the surface but want's to divide those groups on new terms, gender, class, politics themselves(if you aren't with us you are against us)
The right wants interpersonal solidarity (we can accept people individually as long as they let me be) but still likes the nationalistic and anti immigrant rhetoric.
They both would end up back at some kind highly restrictive, facist like end point if left unchecked in my opinion.
The right causes more damage in the short term in my opinion, things like immigrant detention camps, civil liberties abuses through the police courts and prisons.
The left scares me more in the long run because unlike the right, they believe that they hold the correct pure set of ideas(many subgroups in the left think this although the left as a whole can't agree on what the pure set of ideas is) and are much more willing to claim the ends justify the means for any given topic and claim the rules don't apply to them (look at things like the CHOP as an example). Most of my slightly left of democrat friends if really pressed to define what they support end up supporting the violent seizure of assets from groups they feel like have to much (IE an armed populist revolution, the irony being it's the other side who has all the guns)
I know this isn't the place for any of this but this stuff bothers me recently and I hate how if you don't pick a side you are always the bad guy.