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

For example this one night after I got off of work I was charging my phone at 34th Herald Square in NYC while waiting for the C train to arrive and I seen a Subway Rat running around in the train cart and was like " What the ****?? " and when it tried to run away I stomped it's guts out through... show more For example this one night after I got off of work I was charging my phone at 34th Herald Square in NYC while waiting for the C train to arrive and I seen a Subway Rat running around in the train cart and was like " What the ****?? " and when it tried to run away I stomped it's guts out through it's back and killed it.

Another example is when I was walking to the library in Brooklyn NY I came across a baby Mouse and I stomped on it and casually walked away.

Is this normal why or why not??
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