Ah but you see, dave, you must understand where leftism and right-ism came from to be able to gauge its supporters.
Don't ask me about the right since I believe they are currently too insignificant to be bothered with. I harbour no feelings for them, mind you.
However...
Leftism is the brainchild of the lazy generation. The overfed, moral drama queen, rebel kids of the first world in its glory days. The spoilt brats who had no bombs falling on their heads, no stock market collapsing around them, no poverty, no lice and no one putting them in gas chambers. And who so desperately needed a cause to which they could devote their endless time.
This in itself can be traced back to the pathetic moral code that society got itself. You can't speak your mind, you can't be racist, you must save the planet, you must care about everyone, you can't do what you want etc ad infinitum. Oversocialization.
Of course, it is impossible to adhere by this code all the time. So you've got a bunch of people feeling guilty about what they are/are not doing and they want to make up for it, because they (MOST IMPORTANTLY) have the relaxed, leisure time to think about their sins. To turn them over in their heads and wallow in self hatred about them.
They have no threats. No evil dictators about their heads. They live sheltered, cushioned, comfortable lives and they can feel sorry for the blacks (America, bad old days) or the poor or the sick, and so on and so forth, because they have no worries of their own. It's like Maslow's Hierarchy. They had all the basic needs fulfilled so they all had to go and play Jesus.
The right and their brainchild called capitalism built this wealth that make the left so carefree. And the wealth the left are so intent on to divide and destroy, because they didn't work for it.
True, the capitalist right did build the world on the backs of slaves and exploitation. And maybe the left is balancing it out.
It all depends on the times we're in. The right is inherently more efficient, but perhaps cruel because it follows the rules of nature: survival of the fittest. It cares nothing for political correctness. If you're black, earn your job. If you're a woman, earn your job. Don't come begging for something you can't earn standing on your own two feet.
The left is more of a "feel good" stance. A hobby, for the decadent. They show their superiority complexes by demanding rights for the "underprivileged". They act like mini-Messiahs by dishing out rights to women and blacks, as if they somehow believe those people can't earn them by their own merits. However, they do try to provide for the poor and the sick and so on and so forth. This does, though, "breed the weak".
So, in essence, leftism is for the good times. It's the bratty, but kind-ish spoilt kid that spends mom and dad's money because it didn't have to work for it. It's for when the herd is fat and healthy and can waste time on ensuring the stragglers are helped along.
Right-ism is for the tough times. When the entire herd is in danger of a crisis because the stragglers are causing it to degrade. Weaklings and lots of fat. No time for bull****, no time to *****foot around touchy situations. Do what must be done. That was the American attitude when they wiped out all the American Indians and dumped their slaves back in Africa when they had finished building the Free World with them.
Pity the world seems to always confuse which ideology is necessary for which era.