I don't follow suspended accounts

What is the point of blocking suspended accounts?

If Twitter judges the account as OK and removes the suspect they are by definition no longer suspect. If Twitter keeps them on suspect or deletes them there is no need to manually block the account.

How does it benefit someone to block a suspended account? Assuming you are not following the ID in the first place as a block when following removes them from your follow list. That could be a slight benefit. ( Delete or Edit)

Good point in the count.

If an account is suspended it still counts against the 2,000 limit on Twitter. There is no way to unfollow a suspended account but blocking it will achieve the same reduction in your follow account. Granted I am talking about me following someone who became suspended after my follow request rather than the opposite direction. The opposite direction being more on topic. ( Delete or Edit)

Your concerns are a little over the top. Here is why.

Assume that they start out with what looks to you as a normal account. They do nothing that sets off your warning bell. Then they go into full 'bad behavior' mode and end up getting suspended. Would you even know?

Most of the people who start following me are folks I will try to look at when I get a notice they have started to follow. For some that will be the last I ever see of them as they post infrequently and I have no reason to monitor each follower.

To me it is more like a cocktail party where you do not know most of the people attending. They might be listening or they might not be. On Twitter you just cannot tell who is listening in any real way. At a cocktail party you at least have visual clues.

Followers can do little harm so I do not see why it matters who follows me. They cannot send me SPAM. If they tweet a lot and I am not following them I will never know. If I follow them and find I do not like what they have to say I can unfollow them and that will be the end of it.

If I am worried about them seeing what I post I should really be worried about the whole world who is not following reading my posts as they are visible in the public stream. Visible unless you make your stream as private. While some people do use the private option it is almost the exact opposite of the Twitter model so it calls into question why anyone would use Twitter and turn privacy on. I find it very funny when I get follow notices from people who have set themselves to private. If they want a follow back they are not likely to get it given I have no idea if they are interesting enough to follow.

Better to use a facility that is actually designed to be secure rather than Twitter. ( Delete or Edit)

If they "somehow get through? If they stop being suspended, then they aren't suspended. Otherwise, they're deleted. They aren't going to "somehow get through" and "Catch you napping". There's nothing to catch. After all, anyone, anywhere, can read your twitter page at any time. ( Delete or Edit)