Normalization is when the occurrence something increase so that it become common.
In regards in marijuana, More and more people started to disagree with the legal status of marijuana is not because the police lessen their enforcement but because people marijuana is not dangerous anymore. So yes you can say the step 2 is the normalization.
In the regards with homosexual, the analogy is : many people disagree with act itself but still fine hanging out with them. Because they the act of hanging out with homosexual and the practice of homosexual itself is a two different thing. This may normalize the act of hanging out with homosexual but not necessarily the homosexual itself.
If I'm hanging out with a child trafficker, does that increase the number of child trafficking to occur ?
While that could increase the number of people who hanging out with a child trafficker but not the child trafficking itself. The number of child trafficking increases when the law enforcement stop doing its job.
Note that child trafficking is still illegal but hanging out with child trafficker is not.