You probably already know how the history of liberalism developed, but it was developed during tumultuous periods in European history of constant warring due to differences in beliefs (as well criticism on government control on economy by mercantilism). So, modern day liberals have strong, almost co-dependence I would say, to sticking to "decorum" and "process" as you mentioned. I still see many liberals can't fathom the possibility of a far right entrenchment and afraid to even consider of taking up arms or a civil war against a tyrannical government. That being said, to be fair to the liberal American founding fathers, they recognise the possibility of a tyrannical government and included the second amendment as last resort. However, many liberals are afraid to even consider taking arms if it comes to it (which is understandable because of the previous civil war), and think the next midterm elections won't be interfered upon by Trump and his broligarchs.