A look at UK - https://www.sentencingcouncil.org.uk...-revised-2017/
Maximum one month sentence with many aggravating factors to consider before hitting that.
Even Singapore, with a max of 4 years imprisonment for using criminal force and hardly known to go easy on disruptions to law and order had the following sentence below.
amp.scmp.com/news/hong-kong/law-crime/article/1807394/activist-jailed-obstructing-police-during-occupy-protestIn Emmanuel s/o Munisamy v Public Prosecutor  SGDC 72, a sentence of three monthsâ€™ imprisonment was meted out to the accused who, while being handcuffed by a police officer for using abusive language on a public servant, broke free, hit the police officerâ€™s neck and grabbed his head with both hands, causing the police officer to sustain several injuries.
Even comparing to their own previous standards, somebody with a suspended jail sentence, and with another conviction for charging police lines only merited three weeks when a few police officers involved were allegedly injured.
Then you compare it to actual instances of aggression by the pro-establishment people, and yeah. Draw your own conclusions whether the deciding magistrate lost all sense of proportion.