I mean, this is exactly what the Tennessee sheriff accused this guy of doing. The Sheriff said that a meme referencing Trump saying that people 'needed to get over' a school shooting was actually a threat against the school.

This is the problem with going after 'harmful communication'. It is not something that can be defined precisely, which allows government officials to choose to interpret it in whatever way they want when the enforce it. Obviously in these cases, the courts ruled against the official's interpretation, but that didn't stop this guy from having to spend 37 days in jail before they released him.

As they say "you can beat the rap but you can't beat the ride".

While it is good that the UK version doesn't send you to pretrial jail, you still have to fight the charge. You have to respond, spend time in court, hire council, and hope you can convince the courts that your post doesn't fit the definition of incitement to violence.

This has a chilling effect on free speech, even if all the cases are eventually thrown out. This is a tactic the Trump administration has used repeatedly. Go after people in court for things that are clearly not illegal. You make the person fight the charges, both in court and in the public eye, and then the cases are dismissed eventually and the administration moves on. All it does is make people factor this in when deciding how to act; is my act of protest worth having to fight this in court?