A malicious actor could probably do a lot of damage just by stalling and increasing bureaucracy without going "against the interests of the company" in an illegal way.

Not really the SHA has clauses about that (usually under the deadlock provisions https://en.wikipedia.org/wiki/Deadlock_provision), in most cases if you don't show up for a vote or intentionally block it you will be removed, additionally normally shares that you buy as an investment if they come with voting rights would come tied to a voting proxy that proxy is usually the chairman so if you don't show up for a meeting the chairman would vote on your behalf.

Pretty much there isn't that much mess you can do, the SHA will be defined to protect the company, you can't act against the interest of the company, you can't dump the shares since the other shareholders have the right of refusal and there are 101 other regulations.

You also need to remember that in most cases there is no need of a unanimous vote of all shareholders, public companies usually follow the 51% rule which means that if you control 51% of the shares you control the company. There will not be many cases where company operate without a designated majority shareholder, this would scare of investors, the minority shareholders also don't share in any of the revenue of the company unless the company is sold or a dividend is declared so effectively minority stock is "worthless" in most cases and is only used as an investment.

If you own 49% of the company you would only ever see any money if the company is sold, or the majority decided to grant dividends and you effectively can only sell that stock to the company/majority shareholder unless they refuse it and based on the specifics of the SHA they are also allowed to block sells to other parties.