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%
55
flagPakistan
3%
10%
6%
78%
60
flagSouth Africa
5%
10%
5%
78%
19
flagRepublic of Ireland
2%
12%
7%
76%
39
flagNew Zealand
18%
0%
0%
72%
11
flagGermany
5%
12%
9%
69%
123
flagCanada
11%
17%
3%
66%
51
flagItaly
20%
6%
6%
66%
15
flagNorway
8%
8%
16%
66%
12
flagGreece
5%
30%
0%
65%
20
flagthe Netherlands
17%
0%
17%
64%
17
flagthe United Kingdom
11%
13%
11%
62%
252
flagthe United States
13%
11%
11%
61%
600
flagFrance
7%
7%
30%
53%
13
flagPoland
13%
18%
17%
49%
17302
flagMalaysia
41%
8%
4%
45%
24
flagIndia
16%
20%
18%
42%
284
flagthe Philippines
17%
17%
25%
38%
39
flagNigeria
26%
31%
5%
36%
19
flagAlbania
33%
25%
16%
25%
12