If I'm promised a certain percentage of the rewards and rewards WILL be forthcoming, that percentage is what I expect

Then you did not understand the system properly because DPoS has defined governance which explicitly allows for voted hard forks which change the rules. Some rules have a higher to much higher social barrier to being changed such as forks which would take your coins away, or forks which increase inflation (effectively taking them away via a back door). But changes to the allocation of and reductions to the amount of rewards have both happened before. You had no reason to expect or demand that something which already happened before can't happen again (and many things which haven't happened may also happen in the future).

I don't care what he says and I disagree with funding the SPS via non-voluntary means

Non-voluntary would be taking coins out of your balance and as I said above, this has a much higher social barrier to ever happening. Future rewards are not that.

it's the means I disagree with

It is ultimately a judgment call. You get a vote (via choosing witnesses who share your judgment or conclusions). Please use it.