system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are completely unrelated issues (like abortion) able to be tacked on a bill about an unrelated issue like motor cycle safety to be voted on? Why is this legal?

I only give that this as an example as North Carolina is currently attempting. My issue is not what is be voted on exactly, but how two completely different things can be slapped onto the same bill?
gpt
Its usually an attempt to either: 

1.) get a controversial action (that probably wouldn't succeed on its own.) passed by the legislature and/or executive by attaching it to a high-profile bill that is likely to pass.  Since in many cases, removing a provision from a bill is next to impossible, there is a good chance the whole bill will be passed anyway.


2.)  Sabotage:   Attach a controversial amendment to a high-profile bill in hopes that the whole bill will be rejected because of the amendment.