Our prisons are designed for revenge and punishment not just to those going to prison, but to have a terrifying affect on others.
So ironically, the use of 5 years prison time is the real terrorism, in the literal sense of trying to make people terrified of protesting and of putting someone in a cage for 5 years.
In the Netherlands in the last few years a significant difference was seen between how protesting farmers were treated and how climate protesters were treated. The farmers were allowed to do crazy things like setting things on fire on highways and not getting arrested. Eventually some got arrested, and then two of them were released awaiting their court-case because they had a family to take care of and a 40+ hours work week (sic). The climate protesters were usually all arrested, and almost no matter how many they were. Hundreds of protestors ? No problem. Just hijack some public buses as usual and take them out. Farmers ? Oh no, let's not get our food serving workers even more angry than they are! It is almost like cops are trained to counter certain types of protestors only. Maybe they need some better counter farmer protest training.
5 years is also the maximum sentence for illegally selling firearms, violent disorder, performing female circumcision, assault, abandoning young children and some cases of sexually assaulting a child.
Basically the same as planning to block a road /s.