In PA, we do not require any mandatory training to acquire your license to carry firearms (LTCF). It's very rare for a person with a LTCF to accidentally shoot themselves or accidentally shoot others. I'd say it is about the same or more common for police officers to accidentally shoot themselves or others in PA.
Requiring mandatory training is just a way to to discriminate against people of less social economic status from practicing their 2nd amendment rights. Requiring mandatory training is also just a way for people, companies, and politicians to deepen their pockets by taking advantage of firearm owners.
I can't find any studies, but I would love to see the number of firearm-related accidents per year (in a specific state) divided by the number of gun owners (in the same specific state) and see the percentage you get. Then compare those percentages with mandatory training states and non mandatory training states. Until that happens there really isn't a major reason to support mandatory training other than the reasons I listed in my 2nd paragraph.
I'm not against training, and I highly recommend it. I also strongly recommend it for people who weren't raised shooting guns. That being said, I am against MANDATORY training. Until I see solid, indisputable, unbiased evidence, I'll continue being against it.
It's okay to not want to open carry. The problem is with people who do not want the OPTION and RIGHT to be able to open carry. Just because you don't like it, doesn't mean others shouldn't be allowed to practice it. Also nowhere in the 2nd amendment do I see "...the right of the people to keep and bear
concealed arms shall not be infringed..." This basically sums up people who are against having the option to open carry.