Short story: A former co-worker had 3 children. The oldest when she was 16. Until she got married at 29 she used artifical contraception. After she got married she couldn't get pregnant. After a time, her second child was conceived with the help of chemicals.
When she decided to have her next child she had to have IVF. At the time her doctor told her she still might not be able to conceive even with IVF as there were several issues working against each other. She was determined to have another child AT ANY COST.
So when her third child was a year old she was on the pill to regulate her cycle because her doctor told her she wouldn't be having anymore kids anyway, with or without IVF or other chemicals. She is pregnant and due in a few weeks. When she told me about baby number 4 she said that she realized that God gave her her fertility back. After this baby is born she's having her tubes tied. Hmmmm.
Just because we CAN do something does not mean we SHOULD do something.
The moral opinions of the Catholic Church are guidance. The Church tells you which way is North. It's up to you whether you go that way or not.
Presumably, a democratic government steps in when it is or appears to be in the interest of the whole of the people to do or not do a particular thing.
Although I fall into the category of those who think cloning, IVF, etc. is "self will run riot," it is up to individuals to make the choice to follow the guidance of the Catholic Church. The consequences of the choices can seem remote and worth the risk, but ultimately, the price will be paid.