I would say usually 1st/2nd year UNI student like you, usually admire their "senior", no matter what they do you will think that is right.
"咁多人出來綁黑絲帶反校長反警察啦" because of peer pressure, you did it just because you wanna show to the others that you can say no to the authority.
like our kids processing "trouble two".
New term will be start very soon, enjoy your uni life.