The petition site change.org is extremely popular, but many are surprised to learn it is a for-profit corporation. It isn’t a charity, it exists to make money and has investors who expect a return.
Giving a profit-making corporation your real name as well as your opinions on a wide range of topics is not a wise idea in the long term. That sort of data is very valuable to advertisers, and sooner or later a company may be tempted to sell it to them.
Governmental Petition Portals
For political issues, you should petition governments directly on issues. This more easily gets the attention of people in power, is less likely to sell your data, and governments are often compelled by law to respond to petitions which receive enough signatures.
In some countries, popular petitions may trigger a parliamentary debate or even a referendum.
(The link op posts has a list with links to these Governmental Petition Portals, but not any other alternative.)
Yea I think a lot of valuable traits can be taught, although you probably know more if you actually studied psychology. But unfortunately I think you are right destructive traits can also be learned. Retraining yourself more desirable traits is much harder than learning it when you're young. A 'good' society is a lot more than just a 'good' government.
But the traits that come with autism aren't just a matter of learning (not sure if you imply that), their brains are formed differently before birth already, just like how people are born with other traits (like being more/less athletic than average or more/less intelligent to name something).