We've not actually made it in any way harder for criminals either, though, since those who tended to break laws with them (with very few exceptions) did so with already illegal or illegally obtained ones.
And again that isn't a reason to give them even easier access to them....
It's also not a good argument for a number of other things, none of which were the point being asserted, either.... So again, what's your point?
As already explained the point is to not allow the use of semi automatic firearms in order to try and help prevent or at least reduce the ability of people to conduct mass shootings. Unlike the US we don't have a big issue with them, I'd quite like to keep it that way.
This doesn't mean that no one is ever going to get shot or that criminals will never be able to get hold of firearms or that someone can't run over people with a car. None of those points negate the usefulness of banning semi auto rifles.