沒錯，we 可以泛指一般人。如：　　

We had a heavy rain yesterday. 昨天下了場大雨。　　

We get a lot of snow in winter. 冬天經常下雪。　　

這兩句中的 we 泛指說話者當地的一般人或所有人。　　

We are all apt to believe what we wish to believe. 人常常愛相信他們愿意相信的東西。

You have to be careful with people you don’t know. 對不認識的人得當心。

這兩句中的 we 泛指普通的一般人或任何人。　　

在 We had a heavy rain yesterday 和 We get a lot of snow in winter中，have 和 get 可以互換，但它們并不是“下”的意思，因為句子主語是 we，正如你所說的“人們”怎么能“下雨”和“下雪”呢？　　

其實，這樣用的 have 和 get 均可理解為“有”（含有“經歷”的意思）：　　

We had a heavy rain yesterday. 字面意思是：昨天我們有過一場雨。即：昨天我們這里下過一場雨　　

We get a lot of snow in winter. 字面意思是：冬天我們會有很多雪。即：冬天我們這里經常下雪。　　

類似的情況英語中有不少，請看看下面的例子（這些 have 都含有“有”的影子，但都不宜直譯為“為”）：

You have a bad temper. 你脾氣很壞。　　

I must have a wash first. 我得先洗一洗。　　

I have a very bad memory. 我記性很不好。　　

The boys had a fight. 男孩們打了一架。　　

She had a frightening dream. 她做了一個噩夢。　　

She had a swim every day. 她每天游一會兒泳。　　

He had had a very happy boyhood. 他童年很幸福。　　

What do you have in your hand? 你手里拿著什么? 　　

I had a win in a competition. 我在一次比賽中獲勝了。　　

She had no respect for Mrs. Hood. 她對胡德夫人毫不尊敬。　　

I usually go home and have a read. 我通�；丶铱匆粫�兒書。　　

If I were you, I should have a good lie. 我要是你我就好好躺一下。　　

I’m sorry I don’t have any money with me. 對不起，我身上沒帶錢。　　

We had some good laughs on the way. 我們在路上好好笑了一陣子。　　

Daddy and I had a long talk this afternoon. 爸和我今天下午談了很長時間。　　

He had not for ten years had a quarrel with anyone. 十年來他從未和任何人吵過架。　　

That night he had an interview with Sybil Merton. 那天晚上他和西比爾頓會晤了一次。　　

The band had been having a rest. Now they started again. 樂隊休息了一會兒，現在又開始演奏。

本回答主要參考《中學英語高頻詞詳解詞典》《張道真英語語法》。