關於英文better副詞的用法問題。?

People will become better protected against the wrongful use of small cameras.

The main verb of the sentence "become" is a linking verb.
Normally, there are two possible complements 補語 (subjective) after the linking verb, namely
(1) predicative nominal / predicate nominative (謂詞名詞); and
(2) predicative adjective 謂詞形容詞

The above sentence belongs to (2), as "protected against ..." is participle phrase acting as adjective to modify the subject "people". And, "become protected" is an equivalent to the passive voice of "start to be protected".

"better" is the comparative of the adverb "well" (adverb of manner), modifying the verbal "protected".

become well protected = 受到很好的保護
become better protected = 受到更好的保護

Adverbs of manner are usually placed after the main verb. It is possible to place the adverb before the verb to place emphasis on the adverb if the verb is transitive.

But some adverbs, such as well, badly, hard, fast, are always placed after the verb. Never will they be placed between the auxiliary verb and the main verb.
examples:
He plays well. He will play well. He has played well. (after action verb "play")
He is protected well. He will be protected well. (not after aux, verb-to-be) passive of "Someone protects him well."
He becomes well protected. He will become well protected. (after linking verb "become" as "protect" is not the main verb)

Therefore, "better" cannot be placed at the end of the sentence according to the rule of adverb positions.

(Note: if "protect" is the main verb in active voice, then it is correct to say: The education campaign protects people against the wrongful use of small cameras better nowadays.)

由於這句只有主動詞become而句子後半部沒有插入另一子句或複句，因此把better放置在句末仍是可以(同樣理解)的。

但是就語氣或英語人的習慣說法而言，become "better protected"是會比 become "protected"..............."better"意識上會更明確和肯定及重點(強調)。

你問把adverb放在那位置是學文法/用文法的同學常嘗試考驗原則(老師)的限制，不過語文是由"使用習性"形成的，不單是理論可否的答案。
[以上這段說話我便是用了英語的文法句式寫中文，因此讀起來很不通順亦難明所講的要點在哪]

學和用語文文法最重要是傳遞作者/講者想要達到的效果。方法/方式是可以多樣的，但能最有效和最精湛地說出來可能只有一種句子結構。

再舉一個錯用的例子：

You better do your homework.
你最好現在就要(開始)做功課了。[是警告語]
You do your homework better.
你做的功課(比之前)好得多了。[是稱讚語]

句子的詞語沒甚麼變，但把better放在不同位置便變出不同意義。