For what reason were hatters considered mad in the Victorian era?

Alice in Wonderland character
hammering the head during hat adjusting
empty hat symbols empty head
mercury poisoning
Mad hatter's disease is a common name for chronic mercury poisoning among hatmakers, who were often exposed to mercury vapors during felting works. Along with physical symptoms such as tremors or loss of hair and teeth, hatters tended to develop characteristic psychological traits, such as pathological shyness and marked irritability.
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Answers by country

Alice in Wonderland character
hammering the head during hat adjusting
empty hat symbols empty head
mercury poisoning
answers
flagAustralia
1%
1%
3%
90%
52
flagPakistan
3%
10%
6%
78%
60
flagSouth Africa
5%
10%
5%
78%
19
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13%
5%
77%
36
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18%
0%
0%
72%
11
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6%
12%
10%
68%
116
flagCanada
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18%
4%
66%
50
flagGreece
5%
30%
0%
65%
20
flagthe Netherlands
17%
0%
17%
64%
17
flagItaly
21%
7%
7%
64%
14
flagNorway
9%
9%
18%
63%
11
flagthe United States
13%
11%
11%
62%
591
flagthe United Kingdom
11%
14%
11%
61%
243
flagFrance
7%
7%
30%
53%
13
flagPoland
13%
18%
17%
49%
17186
flagMalaysia
43%
8%
4%
43%
23
flagIndia
17%
20%
18%
42%
276
flagthe Philippines
18%
18%
23%
39%
38
flagNigeria
26%
31%
5%
36%
19
flagAlbania
33%
25%
16%
25%
12