They rioted, destroyed private property, kidnapped and beat political opponents.
But not just 'because they felt like it'.
There is a stark difference between fighting for a just-cause war based on principles of liberty against a lawless and tyrannical power, and a means-to-an-end, whatever-goes melee for punishment's sake because you hate the certain politics and beliefs, property or wealth of a people.
A French Revolution bloodbath is what comes out of that - and it is precisely why Alexis DeToqueville came here to find out why the Revolution in his country turned out so very differently that the one fought here.
Our Founders refused to surrender principles for expediency when waging a war. Washington had requirements of his regulars to attend church when not on active duty, part of the reason was because he did not want his troops to engage in the same types of barbarism the British had hired the Hessians to perform on the Colonists.
The ends justify the means is the tool that has been used throughout history to commit atrocities. It is how people end up in ovens. They thought they were virtuous in doing so, for the greater good...
That is the slippery slope to downright evil.
BINGO. Exactly.