While I'd agree that revolutions are often a bloody mess there are a number of examples in recent history where that is not the case. (e.g. The Velvet Revolution[1])
France, UK & the USA all also had bloody revolutions that resulted in democracy (or at least the widely understood view of what democracy is).
The UK's civil war established a theocratic military dictatorship. The 'glorious revolution' installed not a republic but a constitutional monarchy with a Protestant king subject to the rule of Parliament. Electoral democracy followed later, piecemeal.
France and the US have more parallels: first revolution in late 1700s, delivering either incomplete or non-lasting freedom; eventually another revolution in the late 1800s, establishing more freedom; final formal abandonment of colonialism/slavery round about 1968. Hmm, that rather implies that the timetable for the next one is somewhere around 2070.
[citation needed] - or at least an explanation of what you mean by "liberal" here.
The ease with which some throw around rizing citizens and overthrown governments is mind boggling.