Kickstarter projects will go on to be successful and may get acquired in the future, so you bring up a good point. The negative reaction seems to be at the part

Kickstarter projects will go on to be successful and may get acquired in the future, so you bring up a good point. The negative reaction seems to be at the particular acquirer (Facebook) and not the acquisition itself. Unless backers have an actual equity stake, they have little say in the future of the projects they fund.