> But I don't see why you explain the situation because of the "all or none" of the left

I'm not sure about the person whose comment you addressed but, from experience, I can think of these reasons:

1. A Democratic supporter naturally assumes the Democratic party is the smarter one and holds them to a higher standard.

2. Most of us independents have written the GOP off as a total loss sometime after last January. I suspect, many Dem supporters had arrived at the same conclusion a tad earlier. In other words, what's the point of beating a dead horse?

3. follows from the previous two - there is a sense of real urgency as to make the Dem party do something meaningful, so by pointing the criticism only to them we deprive them from their favorite excuse - that the other party is even worse - they've been hysterically eager to use that excuse for many decades.

Otherwise, both parties are very selective about what they do or don't compromise on, but in either case, the public rarely gets something other than the short end of the stick.