Is it normal that I killed animals that carry diseases such as Mice and Rats?

For example this one day I was in the Subway system in NYC waiting for the C Train to come and I literally seen a Subway Rat running around in the Train Cart and when it tried to run away and escape I literally stomped it's ******* guts out through it's back and when I did everybody gasped ( I did what I did because literary NOBODY on the whole ******* train had the BALLS to do it themselves so I decided to man up and do it myself ) Another example is when I was walking to the library in NYC I literally came across a baby Mouse by a Church and stomped on it and killed it and casually walked away. By the way neither the Mouse or the Subway Rat was Bleeding after I killed them. ( Most likely because like my friend they was most likely dehydrated ) Is this Normal and why or why not??