It's not even slippery. It's a high-powered conveyor-belt. The people in power _know_ this was always their ultimate goal. They don't care about you, or your child's, safety. It's all about amassing more power, more control, more influence.
The problem with slippery-slope arguments is not that they are slippery, it's that you can't predict the future to know that the assertion will fall off of it. It's a post-hoc problem.