Sure it matters, if you don’t normalize for sample size your data is meaningless. Here’s a similar example:

I have a farm that produces both red and green apples, last harvest I had to throw away 100 red apples because they went bad, but only 10 green apples for the same reason.

You would think that red apples spoil 10x easier than green ones, but you’re missing the crucial information that my farm produced 10.000 red apples and 1.000 green ones, so in both cases it represented 1% of the whole amount.

This could be the same thing, if there are more Pitbulls than other races it would be expected that they bite more in absolute numbers.