Maybe that is because compromise is usually a win for the Democrats.
Consider for example Obamacare. I think it would be reasonable to assume this represents a compromise over what Democrats really want for healthcare. Now in the future do you think it is more likely that laws will be passed to give Democrats more of what they want on healthcare, or that Obamacare(or substantive parts of it) will be repealed?
To Democrats, "compromise" means only getting 80% of what they want.
We could also look at gun control. What have anti-gun people, (not always, but often Democrats), what have they compromised on? Are machine guns legal again? No. Did they offer some kind of carry permit in Illinois before the Supreme Court forced them to? No. Did they allow handguns in Chicago before the Supreme Court forced them to? No. Did they allow handguns in Washington D.C. before the Supreme Court forced them to? No. Do they say how about you give us background checks for all private sales and we'll give you constitutional carry? No.
For those who haven't realized it, pay attention. Gun banners will never compromise. Never ever. Not until they have all of your guns. They'll start with "high-capacity" mags, then they'll drop the 10-round limit down to 7 (like they already did), then it will be 5, then 3, then 1, then 0.
They will take your "assault weapons" just like they took your machine guns. And then they will take your "sniper rifles". ...Or what normal people call "hunting rifles."
And then they will ban all dealer sales of firearms without a background check and a nice fee. And then they will ban all private sales of firearms without a background check and a nice fee. And then they will just ban the firearms entirely.
And then they will pass $50 ammo fees. And they will require you to pay a fee to get an I.D. card to be able to buy ammo. And then will raise the tax on ammo so you can't afford it.
And then they will pass microstamping laws which are useless and easily circumvented. (California just did that.) And they will pass laws requiring you to have a spent shell casing on file with the state to help solve crimes, which will waste millions of dollars and never solve a crime.
And they will "compromise" and say you can't have this or that type of gun or this or that type of magazine because they are for "military use" only, but the government agents we control who aren't military can have them.
And they will tell you you only need six shots to stop a home intruder. They say six shots is all you need for protection. But if you call 911 because of a home intruder, a dozen or more government agents will show up with the firepower of a small army and body armor and helicopters and even tanks for their protection against that same home intruder.