Why? If you bother to look at the memes routinely plopped down in this stream by leftists, you will see that they pretty much equal the same number of conservative memes and if you open those memes and look at the attached comments then you will typically see leftists routinely spamming the system.
There are lots and lots of leftists here . . . even if most of them have got five each alt-IDs that they routinely switch between.