Half the world is intent on making rules for everything, just because "there ought to be a law" against anything remotely risky or unpleasant. And the other half lashes out by ignoring those rules an doing what the hell they want.
1) If you treat people like children, they will start behaving like them.
2) If you make tons of unreasonable rules, people will start breaking them in protest, and start breaking the reasonable ones as well, especially if it's hard to tell the two apart ("You can't bring your gun on the plane because of terrists, but you also can't bring your bottle of water for the same reason"). Unjust, unreasonable or petty laws endanger all of the law.
Now, having a rule against using selfie sticks in a roller coaster is reasonable, but people choose to ignore that law, or tell others to, because of a whole range of other laws that are silly. And because of the way those laws are enforced (instead of treating them as a means to an end, they are treated as a goal in themselves).