Bad guys?
I don’t think so,well,only nowadays.
In Meiji and Bakumatsu era,they were known by Mibu no
Inu,or dogs of Mibu.
Their first leader,Serizawa kamo wasn’t really friendly,and then Kondo got rid of him.
This happened in Roushigumi.
Now the shinsengumi starts,with Kondo being the leader and Hijikata Toshizo vice leader.
They did a lot of trouble to save people to even more trouble,but the people were ungrateful,and said that they caused much trouble.
Nowadays they are considered great heroes that defended the idiot Tokugawa Yoshinobu,who ended with the magnificent rule of Tokugawa Shogunate.
If he opened Japan to a new era,continuing Tokugawa Shogunate,and making Japan modern and better,with no civil war.