It's an association fallacy - Musk may be a radical extremist on the right, and a technology mogul, you may find yourself aligning with some of his world views (not all of them, remember he is an extremist relative to yourself).

So when people support EFF's technological goals (freedoms for users on technology platforms), if they are themselves possibly on the right, they project their own values onto the organization or system (which here is the EFF).

Never-mind if some of those values are incompatible with the values you think you hold (being authoritarian generally is incompatible with being not being authoritarian about technology). When someone points out the (otherwise obvious) contradiction to you, you're surprised that your set of values is incongruous.

Now this can happen to anyone coming from any political starting point, they agree with something but find it doesn't quite fit with their world views. If you are deeply religious about it, you tend to hold on for dear life and either decide to "pick" on set of values over another (suddenly you realize, actually, yes you would like to enslave everyone) or engage in some form of hypocrisy or another (authoritarians are good, but for some reason or the other I'm going to make an exception for technology).