I understand the consternation -- I have very mixed feelings about the Linux Foundation (I am on the TOC of the CNCF, an LF project), but the reality is that as a 501(c)(6) they are much better resourced than the 501(c)(3)s dedicated to open source. In my opinion, the LF therefore represents our (current) best shot to achieve some common good, and (speaking personally), I have resolved to work from within the LF to make it more useful to the broader constituency of open source communities. (As a concrete example, I championed the LF/CNCF acquiring and relicensing RethinkDB[1].)
Similarly, I think applying a purity test to the LF would be counterproductive: it would end up refusing essentially everyone's money and becoming the FSF or Apache Foundation -- two flat-broke 501(c)(3)s. (Aside, individuals should never ever donate to the LF; donate to a 501(c)(3) instead.)
To sum: I would rather have VMware in than out, and then influence the LF to abide by its broader open source constituency, funding projects at the grass roots that are the lifeblood of open source -- but I also understand those that would view taking VMware's money as selling out that constituency!