Because there are moonbat liberals everywhere. If fields were covered with foam matting, bats ere made of stiff foam, and the balls were NERF balls, nobody would get hurt, and everyone would have fun, IF nobody kept score and every one went home a winner. /s
Aluminum bats are more likely to cause an injury than a wooden bat because they transfer so much more force to the ball. It's also a pretty cheap way to give childen a false sense of self-esteem.
The state and cities that are passing laws to change the bat type is the appropriate level of government to be making those decisions. These are government/public school leagues. What is the 'conservative' position on who would decide what is appropriate or not? This is a Democracy.
If you want to start your own private league of babies who play with aluminum bats (try making them out of TI instead - then your little angel will be an even BETTER slugger!) go ahead. But if there is a liberal/conservative line here, your with Mayor Bloomberg and the rest of the lefties.
To paraphrase Jocelyn Elders, "We need safer balls."