Politics is the US' worst export product, whether it's the unhinged right and their nonsense or the unhinged left and their nonsense. I wish fewer people would pay attention to it.
Assange was thrown into jail for basic journalism, but that was at America's behest.
Technically if you're arrested you're thrown in jail (overnight or for a few days).
Cassandra Vera Paz, Spanish, aged 22 during the event, was charged in 2016 with "injury to victims of terrorism", in the context of legislation "against the praising of terrorism", after she posted jokes on twitter - the homicide through explosives of Luis Carrero Blanco, ally to General Franco, by the Basque separatist group ETA, was related to a (NASA like) "space programme". She was condemned in 2017 to spend one year in prison (plus a year of "absolute disqualification" from public offices and aid). The ruling was reversed in 2018 by the Supreme Court, which called the jokes socially and morally reprehensible but not sufficient for penal sanction.
Granddaughter Lucia Carrero Blanco reportedly wrote «I’m scared of a society in which freedom of expression, however regrettable it may be, can lead to jail sentences».
This is part of a very reprehensible and long history of fighting against household terrorism, said history includes things such as torture on innocents or state terrorism.
On top of that, the National Assembly has a bad reputation for pulling this kind of abusive stunts specifically when it's about "praising terrorism" and I don't think I personally know a single person who actually supports this. This is probably why the Supreme Court reversed the decision.
On the other hand I do know many people who tell jokes about Carrero Blanco, or in even worse taste, Irene Villa, a journalist who lost both her legs in another attack with explosives from ETA. Remarkably Irene Villa is on record stating that she enjoys and supports jokes such as "What does Irene Villa do when her friends go and wax her legs? She varnishes hers".
I believe this last bit to be relevant because no doubt that could be considered brutally offensive, literally making fun of a disabled person, but there is nobody offended here, it is, instead, recognized that humor is an important way of coping with a difficult reality, and the history of Basque terrorism is indeed a difficult one.